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"type": "UserDefined", "kind": "user" }, { "address": 46080, "name": "identity", "type": "Field", "kind": "user" }, { "address": 46336, "name": "zero_table", "type": "Field", "kind": "user" }, { "address": 46592, "name": "div4", "type": "UserDefined", "kind": "user" }, { "address": 46848, "name": "mod4_x64", "type": "UserDefined", "kind": "user" }, { "address": 47104, "name": "div16", "type": "UserDefined", "kind": "user" }, { "address": 47360, "name": "mod16_x16", "type": "UserDefined", "kind": "user" }, { "address": 47616, "name": "shift_table_ba", "type": "UserDefined", "kind": "user" }, { "address": 47872, "name": "times4", "type": "UserDefined", "kind": "user" }, { "address": 48112, "name": "frames_0", "type": "UserDefined", "kind": "user" }, { "address": 49136, "name": "frames_1", "type": "UserDefined", "kind": "user" }, { "address": 49152, "name": "frames_1a", "type": "UserDefined", "kind": "user" }, { "address": 49157, "name": "frames_1b", "type": "UserDefined", "kind": "user" }, { "address": 50160, "name": "frames_2", "type": "UserDefined", "kind": "user" }, { "address": 50176, "name": "j_C400", "type": "Jump", "kind": "auto" }, { "address": 50186, "name": "frames_2b", "type": "UserDefined", "kind": "user" }, { "address": 51184, "name": "frames_3", "type": "UserDefined", "kind": "user" }, { "address": 57344, "name": "level_header", "type": "Field", "kind": "user" }, { "address": 57401, "name": "lemmings_total", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57404, "name": "rate_min", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57409, "name": "minutes", "type": "Field", "kind": "user" }, { "address": 57412, "name": "skill_tens", "type": "Field", "kind": "user" }, { "address": 57420, "name": "skill_units", "type": "Field", "kind": "user" }, { "address": 57428, "name": "dir_alternate", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57429, "name": "next_direction", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57430, "name": "save_share", "type": "Field", "kind": "user" }, { "address": 57436, "name": "level_colours", "type": "Field", "kind": "user" }, { "address": 57440, "name": "colour_mc0", "type": "Field", "kind": "user" }, { "address": 57444, "name": "colour_sprite", "type": "Field", "kind": "user" }, { "address": 57448, "name": "colour_mc1", "type": "Field", "kind": "user" }, { "address": 57452, "name": "entrances", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57453, "name": "entrance_col_lo", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57454, "name": "entrance_row", "type": "Field", "kind": "user" }, { "address": 57461, "name": "exits", "type": "Field", "kind": "user" }, { "address": 57462, "name": "exit_col_lo", "type": "Field", "kind": "user" }, { "address": 57463, "name": "exit_row", "type": "Field", "kind": "user" }, { "address": 57466, "name": "exit2_flag", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57467, "name": "object_count", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57468, "name": "cell_map_flags", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57469, "name": "water_flag", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57470, "name": "water_kind", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57471, "name": "clock_flag", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57472, "name": "level_pointers", "type": "Field", "kind": "user" }, { "address": 57474, "name": "objects_col_ptr", "type": "Field", "kind": "user" }, { "address": 57476, "name": "objects_ptr_3", "type": "Field", "kind": "user" }, { "address": 57478, "name": "objects_ptr_4", "type": "Field", "kind": "user" }, { "address": 57480, "name": "objects_ptr_5", "type": "Field", "kind": "user" }, { "address": 57482, "name": "objects_ptr_6", "type": "Field", "kind": "user" }, { "address": 57484, "name": "objects_ptr_7", "type": "Field", "kind": "user" }, { "address": 57486, "name": "cell_map_lo", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57487, "name": "cell_map_hi", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57488, "name": "cell_map_ptr2", "type": "Field", "kind": "user" }, { "address": 57490, "name": "cell_map_ptr3", "type": "Field", "kind": "user" }, { "address": 57492, "name": "unpack_terrain", "type": "Subroutine", "kind": "user" }, { "address": 57538, "name": "b_E0C2", "type": "Branch", "kind": "auto" }, { "address": 57554, "name": "b_E0D2", "type": "Branch", "kind": "auto" }, { "address": 57556, "name": "b_E0D4", "type": "Branch", "kind": "auto" }, { "address": 57559, "name": "j_E0D7", "type": "Jump", "kind": "auto" }, { "address": 57565, "name": "b_E0DD", "type": "Branch", "kind": "auto" }, { "address": 57594, "name": "b_E0FA", "type": "Branch", "kind": "auto" }, { "address": 57599, "name": "b_E0FF", "type": "Branch", "kind": "auto" }, { "address": 57622, "name": "a_E116", "type": "AbsoluteAddress", "kind": "auto" }, { "address": 57623, "name": "a_E117", "type": "AbsoluteAddress", "kind": "auto" }, { "address": 57625, "name": "a_E119", "type": "AbsoluteAddress", "kind": "auto" }, { "address": 57626, "name": "a_E11A", "type": "AbsoluteAddress", "kind": "auto" }, { "address": 57635, "name": "b_E123", "type": "Branch", "kind": "auto" }, { "address": 57639, "name": "a_E127", "type": "AbsoluteAddress", "kind": "auto" }, { "address": 57646, "name": "a_E12E", "type": "AbsoluteAddress", "kind": "auto" }, { "address": 57658, "name": "next_packed", "type": "Subroutine", "kind": "user" }, { "address": 57664, "name": "b_E140", "type": "Branch", "kind": "auto" }, { "address": 57667, "name": "b_E143", "type": "Branch", "kind": "auto" }, { "address": 57685, "name": "b_E155", "type": "Branch", "kind": "auto" }, { "address": 57688, "name": "b_E158", "type": "Branch", "kind": "auto" }, { "address": 57699, "name": "b_E163", "type": "Branch", "kind": "auto" }, { "address": 57703, "name": "b_E167", "type": "Branch", "kind": "auto" }, { "address": 57712, "name": "b_E170", "type": "Branch", "kind": "auto" }, { "address": 57724, "name": "b_E17C", "type": "Branch", "kind": "auto" }, { "address": 57731, "name": "b_E183", "type": "Branch", "kind": "auto" }, { "address": 57751, "name": "put_byte", "type": "Subroutine", "kind": "user" }, { "address": 57759, "name": "r_E19F", "type": "Return", "kind": "auto" }, { "address": 57760, "name": "terrain_header", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57761, "name": "terrain_src_lo", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57762, "name": "terrain_dest_hi", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57763, "name": "terrain_dest_lo", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57764, "name": "terrain_end_hi", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57765, "name": "terrain_end_lo", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57766, "name": "terrain_lit_hi", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57767, "name": "terrain_lit_lo", "type": "AbsoluteAddress", "kind": "user" }, { "address": 57768, "name": "terrain_packed", "type": "UserDefined", "kind": "user" }, { "address": 58651, "name": "s_E51B", "type": "Subroutine", "kind": "auto" }, { "address": 58673, "name": "terrain_packed_0b", "type": "UserDefined", "kind": "user" }, { "address": 58792, "name": "terrain_packed_1", "type": "UserDefined", "kind": "user" }, { "address": 59816, "name": "terrain_packed_2", "type": "UserDefined", "kind": "user" }, { "address": 60033, "name": "j_EA81", "type": "Jump", "kind": "auto" }, { "address": 60601, "name": "f_ECB9", "type": "Field", "kind": "auto" }, { "address": 60619, "name": "f_ECCB", "type": "Field", "kind": "auto" }, { "address": 60683, "name": "terrain_packed_3a", "type": "UserDefined", "kind": "user" }, { "address": 60840, "name": "terrain_packed_3", "type": "UserDefined", "kind": "user" }, { "address": 61864, "name": "terrain_packed_4", "type": "UserDefined", "kind": "user" }, { "address": 62715, "name": "objects", "type": "UserDefined", "kind": "user" }, { "address": 63739, "name": "objects_b", "type": "UserDefined", "kind": "user" }, { "address": 64000, "name": "objects_last", "type": "UserDefined", "kind": "user" }, { "address": 64001, "name": "level_file_end", "type": "UserDefined", "kind": "user" }, { "address": 64816, "name": "f_FD30", "type": "Field", "kind": "auto" }, { "address": 64848, "name": "KERNAL_RAMTASj", "type": "Predefined", "kind": "system" }, { "address": 64931, "name": "KERNAL_IOINITj", "type": "Predefined", "kind": "system" } ], "comments": [ { "address": 2049, "type": "line", "text": "for each byte-column of the level's terrain (0-$77), the low byte of its first byte in the sprite shapes at $8000; with $4B40 the high byte. Read by copy_column, the preview and the level's unpacker" }, { "address": 2169, "type": "line", "text": "plays one level from its loaded state: screen off, all RAM in ($01 = $35), $3000 (music), then $08C7; afterwards $0893 restores the KERNAL's interrupts and returns to the loop at $CBBA" }, { "address": 2195, "type": "line", "text": "after a level: $01 = $3F, resets the CIA and IRQ set-up with the KERNAL's own $FDA3 and $FD50, the screen editor ($E51B), and copies the video chip's default registers ($ECB9) and the KERNAL vectors ($FD30) back" }, { "address": 2208, "type": "line", "text": "named only as the operand of the BIT at $5535 (the skip idiom), so nothing reads it as data" }, { "address": 2210, "type": "line", "text": "the low byte of the STX at $08A1; named only as the operand of the BIT at $25FB, $260E, the idiom that skips the next two bytes, so nothing reads it as data" }, { "address": 2217, "type": "line", "text": "the high byte of the JSR at $08A7; named only as the operand of the BIT at $215A, $2274, $254A, $25E0, the idiom that skips the next two bytes, so nothing reads it as data" }, { "address": 2247, "type": "line", "text": "sets up a level for play: $1000 (lemmings), $0FA7 (screens), the raster interrupt at $09C7 on line 0, the NMI to the RTI at $0B56, one pass of $0E39, the scroll ($0C90), then the main loop" }, { "address": 2282, "type": "line", "text": "band 0's handler (line 251), the play interrupt's once-a-frame work: marks the frame ($057B); swaps the two screens when the main loop has finished one (a $041D request and 5 frames since the last); then plays the music ($3006, when $2E51 bit 7), runs $1916 while the level is not ending, reads the keyboard ($0A5A), the pointer ($17BF), sets the play area's video registers ($0F42) and the terrain sprites ($0B73), then sets the next band" }, { "address": 2357, "type": "line", "text": "band 1's handler (line 60): moves sprites 0-3 down 21 lines, below sprites 4-7 ($0BDD)" }, { "address": 2363, "type": "line", "text": "the handler of bands 2, 4 ... 14: nine NOPs to wait for the beam, then advances the pointers of sprites 0-3 to the next slice of terrain ($43F8-$43FB; the INCs' high bytes rewritten for the shown screen by $0F42) and moves sprites 4-7 down 21 lines ($0BF0)" }, { "address": 2374, "type": "line", "text": "the high byte of the INC at $0944, rewritten as the game runs, by $0F4D" }, { "address": 2377, "type": "line", "text": "the high byte of the INC at $0947, rewritten as the game runs, by $0F50" }, { "address": 2380, "type": "line", "text": "the high byte of the INC at $094A, rewritten as the game runs, by $0F53" }, { "address": 2383, "type": "line", "text": "the high byte of the INC at $094D, rewritten as the game runs, by $0F56" }, { "address": 2390, "type": "line", "text": "the handler of bands 3, 5 ... 13: nine NOPs, then advances the pointers of sprites 4-7 ($43FC-$43FF) and moves sprites 0-3 down 21 lines" }, { "address": 2401, "type": "line", "text": "the high byte of the INC at $095F, rewritten as the game runs, by $0F59" }, { "address": 2404, "type": "line", "text": "the high byte of the INC at $0962, rewritten as the game runs, by $0F5C" }, { "address": 2407, "type": "line", "text": "the high byte of the INC at $0965, rewritten as the game runs, by $0F5F" }, { "address": 2410, "type": "line", "text": "the high byte of the INC at $0968, rewritten as the game runs, by $0F62" }, { "address": 2417, "type": "line", "text": "band 15's handler (line 205): nine NOPs, then advances the pointers of sprites 4-7 for the last row, moving none" }, { "address": 2428, "type": "line", "text": "the high byte of the INC at $097A, rewritten as the game runs, by $0F65" }, { "address": 2431, "type": "line", "text": "the high byte of the INC at $097D, rewritten as the game runs, by $0F68" }, { "address": 2434, "type": "line", "text": "the high byte of the INC at $0980, rewritten as the game runs, by $0F6B" }, { "address": 2437, "type": "line", "text": "the high byte of the INC at $0983, rewritten as the game runs, by $0F6E" }, { "address": 2441, "type": "line", "text": "band 16's handler (line 217), the bottom of the play area: a short delay, $D018 = $0C for the panel's characters, then the panel's colours and sprites ($0A04)" }, { "address": 2457, "type": "line", "text": "ends every band: steps the band index at $09CF (back to 0 after the count at $09D0), sets the raster line for the next band from $09F3 and its handler from $09D1/$09E2 into the JMP at $09CC, acknowledges the interrupt and returns" }, { "address": 2503, "type": "line", "text": "hardware IRQ vector in play ($FFFE): saves A, Y and X and jumps to the handler of the current band; the JMP's operand at $09CD is rewritten by $0999" }, { "address": 2509, "type": "line", "text": "the low byte of the JMP at $09CC, rewritten as the game runs, by $09B0" }, { "address": 2510, "type": "line", "text": "the high byte of the JMP at $09CC, rewritten as the game runs, by $09B6" }, { "address": 2511, "type": "line", "text": "which band of the screen the next interrupt is (0 to the count at $09D0)" }, { "address": 2512, "type": "line", "text": "how many bands a frame has" }, { "address": 2513, "type": "line", "text": "low bytes of the 17 band handlers: $08EA, $0935, then $093B and $0956 by turns, $0971, $0989" }, { "address": 2530, "type": "line", "text": "high bytes of the band handlers" }, { "address": 2547, "type": "line", "text": "the raster line of each band's interrupt: 251, 60, 71, 79, 92 ... 197, 205, 217; the terrain bands come every 8 and 13 lines by turns" }, { "address": 2564, "type": "line", "text": "for the skill panel at the bottom: colours $D022/$D023, sprite 3 multicolour, sprite 0 stretched in Y, sprite colours, and four sprites placed from the tables at $3F84-$3F93; sprite 0 is the highlight over the chosen skill, its X from $77C0/$77C8 by the skill at $05C0" }, { "address": 2650, "type": "line", "text": "scans 13 keys, each a row and column of the keyboard from the tables at $77D0 and $77DD: 1-8, +, -, left SHIFT, DEL and the back arrow; each key down goes to $0AB4. Clears the pause flag first, and tracks the double press of DEL ($0580-$0583)" }, { "address": 2720, "type": "line", "text": "the operand of the BPL at $0A9F; named only as the operand of the BIT at $247D, the idiom that skips the next two bytes, so nothing reads it as data" }, { "address": 2740, "type": "line", "text": "acts on one key found down by $0A5A (X = its number): keys 1-8 choose a skill; + raises the release rate and - lowers it, a step every 7 passes held ($0B1A, $0AFD; down to the level's minimum at $E03C, up to 23); SHIFT pauses ($0B36); the back arrow ends the level, but only while paused ($0AF5); DEL arms the nuke on its second press" }, { "address": 2876, "type": "line", "text": "reads control port 2 ($DC00) and spreads its five low bits into $0402-$0406 as $80 for pressed" }, { "address": 2902, "type": "line", "text": "NMI vector in play points at this RTI, so RESTORE does nothing" }, { "address": 2903, "type": "line", "text": "installs the next raster interrupt: X/Y = handler address into $FFFE/$FFFF, A = raster line into $D012" }, { "address": 2931, "type": "line", "text": "places the eight terrain sprites for the frame's first row: no stretching; Y from $4D48 offset by the scroll row ($0407, operand rewritten at $0B89), pointers from $48E8, colour $040A; X positions from $0413 rotated by $0408, with their ninth bits into $D010" }, { "address": 2953, "type": "line", "text": "the operand of the LDA at $0B88, rewritten as the game runs, by $0B81, $0B90" }, { "address": 2982, "type": "line", "text": "the high byte of the STA at $0BA4, rewritten as the game runs, by $0F71" }, { "address": 2985, "type": "line", "text": "the high byte of the LDA at $0BA7; named only as the operand of the BIT at $1621, the idiom that skips the next two bytes, so nothing reads it as data" }, { "address": 3037, "type": "line", "text": "moves sprites 0-3 down 21 lines, below sprites 4-7" }, { "address": 3056, "type": "line", "text": "moves sprites 4-7 down 21 lines, below sprites 0-3" }, { "address": 3075, "type": "line", "text": "clears the lemmings' window (21 columns by 20 rows from column 9 of row 1) on the screen not shown: $4400 when $0421 is 1, otherwise $4000 ($0C08)" }, { "address": 3080, "type": "line", "text": "clears the lemmings' window on the screen at $4000: 20 rows of 21 cells" }, { "address": 3148, "type": "line", "text": "clears the lemmings' window on the screen at $4400" }, { "address": 3216, "type": "line", "text": "moves the view towards the target in $040E/$040F, at most a column a pass ($0DDB), left ($0DA3) or right ($0DBE), and copies the terrain columns that come into view ($0D03/$0D11); then $2A48 and $0CDF" }, { "address": 3295, "type": "line", "text": "from the scroll position, sets the terrain sprites' row offset ($0407, from the fine position and $7D18) and their X rotation ($0408, from $4F40), and remembers the position in $05B5/$05B6" }, { "address": 3331, "type": "line", "text": "when the view has moved left into a new column, copies its characters ($0D1F)" }, { "address": 3337, "type": "line", "text": "branch inside copy_left_column: the column was copied already" }, { "address": 3345, "type": "line", "text": "when the view has moved right into a new column, copies the column 22 to the right ($0D1F)" }, { "address": 3359, "type": "line", "text": "copies one column of the play area's character data between screen buffers at $6000-$61FF; the addresses come from $4B40 and $0801 by the column in X and are written into the loop's own operands" }, { "address": 3437, "type": "line", "text": "the high byte of the LDA at $0D6B, rewritten as the game runs, by $0D23" }, { "address": 3440, "type": "line", "text": "the high byte of the STA at $0D6E, rewritten as the game runs, by $0D46" }, { "address": 3443, "type": "line", "text": "the high byte of the LDA at $0D71, rewritten as the game runs, by $0D26" }, { "address": 3446, "type": "line", "text": "the high byte of the STA at $0D74, rewritten as the game runs, by $0D49" }, { "address": 3449, "type": "line", "text": "the high byte of the LDA at $0D77, rewritten as the game runs, by $0D29" }, { "address": 3452, "type": "line", "text": "the high byte of the STA at $0D7A, rewritten as the game runs, by $0D4C" }, { "address": 3455, "type": "line", "text": "the high byte of the LDA at $0D7D, rewritten as the game runs, by $0D2C" }, { "address": 3458, "type": "line", "text": "the high byte of the STA at $0D80, rewritten as the game runs, by $0D4F" }, { "address": 3461, "type": "line", "text": "the high byte of the LDA at $0D83, rewritten as the game runs, by $0D32" }, { "address": 3464, "type": "line", "text": "the high byte of the STA at $0D86, rewritten as the game runs, by $0D55" }, { "address": 3467, "type": "line", "text": "the high byte of the LDA at $0D89, rewritten as the game runs, by $0D35" }, { "address": 3470, "type": "line", "text": "the high byte of the STA at $0D8C, rewritten as the game runs, by $0D58" }, { "address": 3473, "type": "line", "text": "the high byte of the LDA at $0D8F, rewritten as the game runs, by $0D38" }, { "address": 3476, "type": "line", "text": "the high byte of the STA at $0D92, rewritten as the game runs, by $0D5B" }, { "address": 3479, "type": "line", "text": "the high byte of the LDA at $0D95, rewritten as the game runs, by $0D3B" }, { "address": 3482, "type": "line", "text": "the high byte of the STA at $0D98, rewritten as the game runs, by $0D5E" }, { "address": 3487, "type": "line", "text": "the operand of the CPY at $0D9E, rewritten as the game runs, by $0D68" }, { "address": 3491, "type": "line", "text": "one scroll step left: subtracts the step from the position, the fine part kept within 0-7" }, { "address": 3497, "type": "line", "text": "named only as the operand of the BIT at $163F (the skip idiom), so nothing reads it as data" }, { "address": 3518, "type": "line", "text": "one scroll step right: adds the step to the position, carrying from the fine part into the columns" }, { "address": 3547, "type": "line", "text": "limits the scroll step to one column a pass" }, { "address": 3573, "type": "line", "text": "waits X frames, by the flag the play interrupt sets in $057B" }, { "address": 3587, "type": "line", "text": "sets the play area's colours from the level's four colour tables one step at a time, five frames apart ($0E1C for Y = 0-3)" }, { "address": 3598, "type": "line", "text": "the same backwards, Y = 3-0, turning the screen on" }, { "address": 3612, "type": "line", "text": "takes colour step Y from the level header: background $E05C, multicolours $E060 and $E068, sprite colour $E064; then waits 5 frames" }, { "address": 3641, "type": "line", "text": "one pass of play: scroll ($0C90), clear the hidden screen ($0C03), then $2B96, $1351 and $29B5; unless paused the clock ($0EE9) and $1DD9; then the end test ($0F1B)" }, { "address": 3676, "type": "line", "text": "main loop of play: fades the level in ($0E0E), then waits for each frame and runs one pass ($0E39, $2A37), asking the interrupt to show the new screen ($041D); when the level is over it fades out ($0E03) and clears both screens" }, { "address": 3679, "type": "line", "text": "waits until bit 7 of $0400 is set (the frame flag), then runs the pass" }, { "address": 3695, "type": "line", "text": "clears the frame flag and loops" }, { "address": 3722, "type": "line", "text": "for screen row X, sets $20/$22 to row X of the screen at $4000, $22/$23 to colour RAM, $24/$25 to row X of $4400 and $26/$27 to row X of $4400 again, from the row tables at $49C4/$49DD" }, { "address": 3765, "type": "line", "text": "ends the level: clock to 0:00, $CB46 = 8, the time-up and level-over flags, and the count released set to the level's total so no more come out" }, { "address": 3817, "type": "line", "text": "the level's clock: every 50 frames, one second off the minutes and seconds at $CB39-$CB3B; at 0:00 the level ends ($0EB5)" }, { "address": 3822, "type": "line", "text": "the operand of the ADC at $0EED, rewritten as the game runs, by $1096" }, { "address": 3867, "type": "line", "text": "ends the level when no lemming is left: when $CB3E and $CB3F are both 0 and every lemming has been released, counts 30 passes ($0587) and then sets $0588" }, { "address": 3906, "type": "line", "text": "the play area's video registers: $D016 = $18, the screen at $4000 or $4400 by $0421 ($D018 from $1349, and the sprite pointers' page from $1347 written into the band handlers' INC operands), bank 1, all sprites on, multicolour and behind the characters, and the level's colours" }, { "address": 3908, "type": "line", "text": "sets $D016 for play" }, { "address": 4007, "type": "line", "text": "fills both screens with character 1 and colour RAM with 0, then for rows 1-20 puts character 0 in columns 9-29 and colour 9 in colour RAM, and clears the lemmings' window on both screens" }, { "address": 4086, "type": "line", "text": "five character codes the level set-up replaces in the level's block at ($E080): $B8, $BB, $BC, $BD, $BE" }, { "address": 4091, "type": "line", "text": "what each becomes: $A8, $A9, $AA, $AB, $AC" }, { "address": 4096, "type": "line", "text": "sets the level up for play. Copies the level header's pointers ($E080-$E093) into the operands of the routines that use them; in the $E07B bytes at ($E080) replaces the five codes at $0FF6 by those at $0FFB; $2DB5; silences the three voices ($3003); clears the counters and flags of play; the release rate from $E03C, the music speed from $E07F; copies the terrain sprites $8000-$8FFF to $6000-$6FFF; clears the lemmings' tables (50 each); the skill counts from $E044/$E04C and the clock from $E041; draws the panel ($11B4-$11E5, $15CA); scrolls the view to the start ($057C, from $E06C/$E06D); places the sprites and starts the cursor at 40,80" }, { "address": 4181, "type": "line", "text": "the low byte of the LDA at $1054, rewritten as the game runs, by $100E" }, { "address": 4197, "type": "line", "text": "the low byte of the STA at $1064, rewritten as the game runs, by $1011" }, { "address": 4437, "type": "line", "text": "the high byte of the LDA at $1153, rewritten as the game runs, by $112C, $115C" }, { "address": 4440, "type": "line", "text": "the high byte of the STA at $1156, rewritten as the game runs, by $1131, $115F" }, { "address": 4472, "type": "line", "text": "the low byte of the LDA at $1177, rewritten as the game runs, by $1005" }, { "address": 4637, "type": "line", "text": "the names the panel shows for the lemming under the cursor, eight characters each in the panel's font ($53 a space, the letters from $54): WALKER, CLIMBER, FLOATER, ATHLETE, a blank, FALLER, BLOCKER, DIGGER, BUILDER, BASHER, MINER" }, { "address": 4725, "type": "line", "text": "per action (21), the offset of its name in $121D: blocker $30, floater $10, faller $28, digger $38, builder $40, walker 0, basher $48, miner $50, climber 8; $20 (blank) for the rest. A walker's offset has its climber and floater flags added ($29E2): CLIMBER, FLOATER or ATHLETE" }, { "address": 4746, "type": "line", "text": "per action (21 entries): bit 7 set for an action that cannot take a new skill or be selected ($149C, $167E)" }, { "address": 4767, "type": "line", "text": "per action (21 entries): the pixel row within its character cell at which the lemming's frame is drawn (0, 2 or 7), stored in frame_row ($B1) at $143E and used by $1B23, $1C6A and $1D74" }, { "address": 4788, "type": "line", "text": "per action: the same row for a lemming whose fuse is burning (the top three bits of its flags, $05C7, are not zero), read at $143B after fuse_tick" }, { "address": 4809, "type": "line", "text": "per action (21), the low byte of the offset of its first animation frame in the frame pointer tables ($1FE4)" }, { "address": 4830, "type": "line", "text": "per action, the high byte of the same: 1 for actions 14 and 19, whose frames lie past the 256th entry" }, { "address": 4851, "type": "line", "text": "the frame value at which some actions' animations wrap" }, { "address": 4856, "type": "line", "text": "the byte $1FAB ORs into a lemming's frame bits ($0456) when it reaches the exit: $80; the table's other entries are action_frame_wrap's" }, { "address": 4872, "type": "line", "text": "per action, how much the animation frame in $0456 (bits 3-7) advances a pass: 8 or $10" }, { "address": 4893, "type": "line", "text": "the frame an animation restarts at when it wraps" }, { "address": 4914, "type": "line", "text": "per action, a vertical offset added to the lemming's Y for its drawing" }, { "address": 4935, "type": "line", "text": "the sprite pointers' page for each screen: $47 for the screen at $4400, $43 for $4000 (by $0421)" }, { "address": 4937, "type": "line", "text": "$D018 for each screen" }, { "address": 4939, "type": "line", "text": "the high byte of each screen's start, written into the drawing routines' operands" }, { "address": 4941, "type": "line", "text": "per screen: low byte of the colour or row table the drawing routines use" }, { "address": 4943, "type": "line", "text": "per screen: high byte of the same" }, { "address": 4945, "type": "line", "text": "moves and draws every lemming released so far ($05B7) on the hidden screen: per lemming its action's handler and frame, the cursor test ($167E) and drawing ($1AA2); then the nuke, which gives each lemming in turn a fuse ($04EC = $BF), and the skill given at the cursor ($1508-$1538)" }, { "address": 4958, "type": "line", "text": "an entry inside the BIT at $135D: entered here, its operand runs as LDA #$00; reached by $1356 BEQ, while the way through the BIT skips it" }, { "address": 5210, "type": "line", "text": "the operand of the LDA at $1459, rewritten as the game runs, by $144E, $1F1B, $1F42" }, { "address": 5213, "type": "line", "text": "the operand of the SBC at $145C, rewritten as the game runs, by $13EB, $13F0, $13F4, $1402" }, { "address": 5217, "type": "line", "text": "the operand of the LDA at $1460, rewritten as the game runs, by $1456, $1F23, $1F4A, $21AE, $24FC, $258E and 1 more" }, { "address": 5219, "type": "line", "text": "the operand of the SBC at $1462, rewritten as the game runs, by $13F8" }, { "address": 5231, "type": "line", "text": "the operand of the LDA at $146E, rewritten as the game runs, by $1FE7" }, { "address": 5239, "type": "line", "text": "the operand of the SBC at $1476, rewritten as the game runs, by $1393" }, { "address": 5251, "type": "line", "text": "the operand of the SBC at $1482, rewritten as the game runs, by $139B" }, { "address": 5276, "type": "line", "text": "a lemming's bomb fuse ($04EC): 5 off per pass unless paused; below $20 the lemming stops what it does and explodes (action 5, through $2160)" }, { "address": 5433, "type": "line", "text": "the low byte of the JSR at $1538, rewritten as the game runs, by $152F" }, { "address": 5434, "type": "line", "text": "the high byte of the JSR at $1538, rewritten as the game runs, by $1535" }, { "address": 5436, "type": "line", "text": "the release rate's two digits in the panel, from the rate step at $0578 through $4FB8/$4FD0" }, { "address": 5456, "type": "line", "text": "takes one of the chosen skill off its count ($05C8 tens, $05D2 units), plays sound $1D and redraws the count ($1568)" }, { "address": 5480, "type": "line", "text": "draws a skill's count (Y = skill) as two digits in the panel, at the cell from $77EA; a count of 0 shows as blank" }, { "address": 5519, "type": "line", "text": "adds one to the two-digit count of lemmings out at $CB3E/$CB3F (decimal, a digit a byte); entered at $1592 (inside the BIT at $1591, which hides LDX #$00) it adds one to the count of lemmings under the cursor at $CB3C/$CB3D instead" }, { "address": 5522, "type": "line", "text": "an entry inside the BIT at $1591: entered here, its operand runs as LDX #$00; reached by $1695 JSR, while the way through the BIT skips it" }, { "address": 5544, "type": "line", "text": "takes one off the two-digit count of lemmings out at $CB3E/$CB3F, when one leaves the level" }, { "address": 5562, "type": "line", "text": "low bytes of the eight routines that give a skill to the selected lemming" }, { "address": 5570, "type": "line", "text": "high bytes of the same" }, { "address": 5578, "type": "line", "text": "draws all ten counts of the panel (release rate twice and the eight skills), then the 13 fixed cells of the panel from the table at $7D90" }, { "address": 5606, "type": "line", "text": "skill 1: sets bit 1 of the lemming's flags at $0456 (once set, it stays for the level); refused when it is set already; then takes the skill off its count ($1550)" }, { "address": 5625, "type": "line", "text": "skill 2: sets bit 2 of the lemming's flags at $0456; refused when it is set already" }, { "address": 5643, "type": "line", "text": "skill 3: starts the lemming's fuse ($04EC = $BF) unless one is burning" }, { "address": 5656, "type": "line", "text": "skill 5: action $0A, or $0B for a lemming facing the other way (bit 7 of $0424; the BIT at $1621 hides LDA #$0B)" }, { "address": 5666, "type": "line", "text": "an entry inside the BIT at $1621: entered here, its operand runs as LDA #$0B; reached by $161D BMI, while the way through the BIT skips it" }, { "address": 5671, "type": "line", "text": "skill 7: action $0E, or $0F the other way" }, { "address": 5681, "type": "line", "text": "an entry inside the BIT at $1630: entered here, its operand runs as LDA #$0F; reached by $162C BMI, while the way through the BIT skips it" }, { "address": 5686, "type": "line", "text": "skill 6: action $0C, or $0D the other way" }, { "address": 5696, "type": "line", "text": "an entry inside the BIT at $163F: entered here, its operand runs as LDA #$0D; reached by $163B BMI, while the way through the BIT skips it" }, { "address": 5701, "type": "line", "text": "skill 4: action 0" }, { "address": 5708, "type": "line", "text": "skill 8: action $06" }, { "address": 5712, "type": "line", "text": "gives the new action in A (written into the ORA at $166E) to lemming Y unless its action is 2, the same one, a blocker's (0 or 1), or $10; keeps bits 6-7 of $0424, takes the skill off its count and starts the action's animation ($2163)" }, { "address": 5743, "type": "line", "text": "the operand of the ORA at $166E, rewritten as the game runs, by $1650" }, { "address": 5754, "type": "line", "text": "the operand of the LDX at $1679, rewritten as the game runs, by $1673" }, { "address": 5758, "type": "line", "text": "is this lemming under the cursor? Takes the nearest by $4DFA among the lemmings that can take a skill ($128A), into $05C1" }, { "address": 5785, "type": "line", "text": "the operand of the LDA at $1698, rewritten as the game runs, by $168C" }, { "address": 5843, "type": "line", "text": "reads the joystick or, when $CB38 bit 7 says a mouse was found, the mouse; fire with nothing else pending asks for the skill to be given ($05C4)" }, { "address": 5886, "type": "line", "text": "an entry inside the BIT at $16FD: entered here, its operand runs as LDA #$00; reached by $16E7 BPL, while the way through the BIT skips it" }, { "address": 5892, "type": "line", "text": "reads the 1351 mouse through the SID's paddle registers: X from $D419 and Y from $D41A, each as the change since the last read ($1768, $1795), added to the cursor at $B6/$B8; at the edges of the play area the view scrolls ($1735, $1751)" }, { "address": 5912, "type": "line", "text": "reads the paddle Y register $D41A" }, { "address": 5941, "type": "line", "text": "keeps the cursor's X within 4-$53 (in steps of two pixels); past either edge the view scrolls instead" }, { "address": 5961, "type": "line", "text": "an RTS no path reaches, after the JMP above" }, { "address": 5969, "type": "line", "text": "keeps the cursor's Y within $11-$A7" }, { "address": 5992, "type": "line", "text": "the change in a paddle reading since the last one, as the 1351 sends it: 7 bits, halved twice for X" }, { "address": 6037, "type": "line", "text": "the same for Y, halved once" }, { "address": 6079, "type": "line", "text": "selects control port 2 for the SID's paddle lines ($DC00 = $80), keeping the old value at $0594" }, { "address": 6091, "type": "line", "text": "moves the cursor with the joystick: up and down accelerate in $0589/$058A up to 4 lines a frame, left and right in $058C/$058D up to 2; at the left and right edges the view scrolls ($1867, $18ED)" }, { "address": 6247, "type": "line", "text": "asks the view to move right by two pixels, while the scroll delay $041F allows" }, { "address": 6255, "type": "line", "text": "moves the scroll target two pixels right, to the end of the level (column $38, fine 7)" }, { "address": 6381, "type": "line", "text": "moves the scroll target two pixels left, to column 0" }, { "address": 6422, "type": "line", "text": "builds the cursor: puts back the four characters it covered last frame, then at the new position saves them ($05B9-$05BC), replaces them with characters $FC-$FF, and draws into those the old characters' pixels ORed with the cursor shape for the position within the cell ($48F0, $48F8, $49F6, $4BEA)" }, { "address": 6590, "type": "line", "text": "the low byte of the LDA at $19BD, rewritten as the game runs, by $1976" }, { "address": 6591, "type": "line", "text": "the high byte of the LDA at $19BD, rewritten as the game runs, by $197C" }, { "address": 6632, "type": "line", "text": "the high byte of the LDA at $19E6, rewritten as the game runs, by $1940" }, { "address": 6661, "type": "line", "text": "the high byte of the LDA at $1A03, rewritten as the game runs, by $1943" }, { "address": 6694, "type": "line", "text": "the high byte of the LDA at $1A24, rewritten as the game runs, by $1946" }, { "address": 6723, "type": "line", "text": "the high byte of the LDA at $1A41, rewritten as the game runs, by $1949" }, { "address": 6734, "type": "line", "text": "the low byte of the LDA at $1A4D, rewritten as the game runs, by $19E3" }, { "address": 6735, "type": "line", "text": "the high byte of the LDA at $1A4D, rewritten as the game runs, by $19E9" }, { "address": 6738, "type": "line", "text": "the high byte of the STA at $1A50, rewritten as the game runs, by $1967" }, { "address": 6740, "type": "line", "text": "the low byte of the LDA at $1A53, rewritten as the game runs, by $1A00" }, { "address": 6741, "type": "line", "text": "the high byte of the LDA at $1A53, rewritten as the game runs, by $1A06" }, { "address": 6744, "type": "line", "text": "the high byte of the STA at $1A56, rewritten as the game runs, by $196A" }, { "address": 6746, "type": "line", "text": "the low byte of the LDA at $1A59, rewritten as the game runs, by $1A21" }, { "address": 6747, "type": "line", "text": "the high byte of the LDA at $1A59, rewritten as the game runs, by $1A27" }, { "address": 6750, "type": "line", "text": "the high byte of the STA at $1A5C, rewritten as the game runs, by $196D" }, { "address": 6752, "type": "line", "text": "the low byte of the LDA at $1A5F, rewritten as the game runs, by $1A3E" }, { "address": 6753, "type": "line", "text": "the high byte of the LDA at $1A5F, rewritten as the game runs, by $1A44" }, { "address": 6756, "type": "line", "text": "the high byte of the STA at $1A62, rewritten as the game runs, by $1970" }, { "address": 6769, "type": "line", "text": "the high byte of the LDA at $1A6F, rewritten as the game runs, by $194F" }, { "address": 6771, "type": "line", "text": "the low byte of the ORA at $1A72, rewritten as the game runs, by $198B" }, { "address": 6772, "type": "line", "text": "the high byte of the ORA at $1A72, rewritten as the game runs, by $1994" }, { "address": 6775, "type": "line", "text": "the high byte of the STA at $1A75, rewritten as the game runs, by $1952" }, { "address": 6778, "type": "line", "text": "the high byte of the LDA at $1A78, rewritten as the game runs, by $1955" }, { "address": 6780, "type": "line", "text": "the low byte of the ORA at $1A7B, rewritten as the game runs, by $199D" }, { "address": 6781, "type": "line", "text": "the high byte of the ORA at $1A7B, rewritten as the game runs, by $19A6" }, { "address": 6784, "type": "line", "text": "the high byte of the STA at $1A7E, rewritten as the game runs, by $1958" }, { "address": 6795, "type": "line", "text": "the high byte of the LDA at $1A89, rewritten as the game runs, by $195B" }, { "address": 6797, "type": "line", "text": "the low byte of the ORA at $1A8C, rewritten as the game runs, by $198E" }, { "address": 6798, "type": "line", "text": "the high byte of the ORA at $1A8C, rewritten as the game runs, by $1997" }, { "address": 6801, "type": "line", "text": "the high byte of the STA at $1A8F, rewritten as the game runs, by $195E" }, { "address": 6804, "type": "line", "text": "the high byte of the LDA at $1A92, rewritten as the game runs, by $1961" }, { "address": 6806, "type": "line", "text": "the low byte of the ORA at $1A95, rewritten as the game runs, by $19A0" }, { "address": 6807, "type": "line", "text": "the high byte of the ORA at $1A95, rewritten as the game runs, by $19A9" }, { "address": 6810, "type": "line", "text": "the high byte of the STA at $1A98, rewritten as the game runs, by $1964" }, { "address": 6818, "type": "line", "text": "draws one lemming as a software sprite: for each of the screen cells it covers (up to three rows of two), takes a fresh character from the counter at $0422 (or reuses the one already there; codes $F4 and up go through $2D48) and ORs the lemming's frame into it. The characters' bitmap addresses come from $74C0/$75C0" }, { "address": 6844, "type": "line", "text": "the high byte of the LDA at $1ABA, rewritten as the game runs, by $13A4" }, { "address": 6851, "type": "line", "text": "the low byte of the STA at $1AC2, rewritten as the game runs, by $1AB7" }, { "address": 6852, "type": "line", "text": "the high byte of the STA at $1AC2, rewritten as the game runs, by $1ABD" }, { "address": 6879, "type": "line", "text": "the low byte of the LDA at $1ADE, rewritten as the game runs, by $13C5" }, { "address": 6880, "type": "line", "text": "the high byte of the LDA at $1ADE, rewritten as the game runs, by $13D4" }, { "address": 6898, "type": "line", "text": "the low byte of the LDA at $1AF1, rewritten as the game runs, by $13C8" }, { "address": 6899, "type": "line", "text": "the high byte of the LDA at $1AF1, rewritten as the game runs, by $13D7" }, { "address": 6917, "type": "line", "text": "the low byte of the LDA at $1B04, rewritten as the game runs, by $13CB" }, { "address": 6918, "type": "line", "text": "the high byte of the LDA at $1B04, rewritten as the game runs, by $13DA" }, { "address": 6931, "type": "line", "text": "the operand of the ADC at $1B12, rewritten as the game runs, by $1EF6" }, { "address": 6994, "type": "line", "text": "the high byte of the LDA at $1B50, rewritten as the game runs, by $13A7" }, { "address": 7040, "type": "line", "text": "the high byte of the LDA at $1B7E, rewritten as the game runs, by $13AA" }, { "address": 7089, "type": "line", "text": "the high byte of the LDA at $1BAF, rewritten as the game runs, by $13AD" }, { "address": 7140, "type": "line", "text": "the high byte of the LDA at $1BE2, rewritten as the game runs, by $13B0" }, { "address": 7191, "type": "line", "text": "the high byte of the LDA at $1C15, rewritten as the game runs, by $13B3" }, { "address": 7242, "type": "line", "text": "the high byte of the LDA at $1C48, rewritten as the game runs, by $13B6" }, { "address": 7268, "type": "line", "text": "(inside draw_lemming) points the drawing loops at the frame's graphics from $3C00/$3D2C/$3E58/$2EA0 by frame number" }, { "address": 7291, "type": "line", "text": "the high byte of the ADC at $1C79, rewritten as the game runs, by $1C58, $1CB5" }, { "address": 7305, "type": "line", "text": "the high byte of the ADC at $1C87, rewritten as the game runs, by $1C5B, $1CB8" }, { "address": 7316, "type": "line", "text": "the operand of the LDA at $1C93, rewritten as the game runs, by $1C6F" }, { "address": 7320, "type": "line", "text": "the high byte of the ADC at $1C96, rewritten as the game runs, by $1C5E, $1CBB" }, { "address": 7334, "type": "line", "text": "the high byte of the ADC at $1CA4, rewritten as the game runs, by $1C61, $1CBE" }, { "address": 7367, "type": "line", "text": "the operand of the LDA at $1CC6, rewritten as the game runs, by $1B14" }, { "address": 7376, "type": "line", "text": "the operand of the LDA at $1CCF, rewritten as the game runs, by $1C72" }, { "address": 7399, "type": "line", "text": "the operand of the LDA at $1CE6, rewritten as the game runs, by $1C75" }, { "address": 7453, "type": "line", "text": "the operand of the LDA at $1D1C, rewritten as the game runs, by $1B17" }, { "address": 7496, "type": "line", "text": "ORs a lemming's frame into the claimed characters, row by row; the two colour bits of each pixel come from $B400/$B500 (a byte's pixels spread for the X position) and the frame's mask at $3090/$30A0" }, { "address": 7497, "type": "line", "text": "the low byte of the LDX at $1D48, rewritten as the game runs, by $1C7C" }, { "address": 7498, "type": "line", "text": "the high byte of the LDX at $1D48, rewritten as the game runs, by $1C8A" }, { "address": 7501, "type": "line", "text": "the high byte of the LDA at $1D4B, rewritten as the game runs, by $1D25" }, { "address": 7503, "type": "line", "text": "the low byte of the ORA at $1D4E, rewritten as the game runs, by $1B4A" }, { "address": 7504, "type": "line", "text": "the high byte of the ORA at $1D4E, rewritten as the game runs, by $1B53" }, { "address": 7506, "type": "line", "text": "the low byte of the ORA at $1D51, rewritten as the game runs, by $1CD5, $1D02" }, { "address": 7507, "type": "line", "text": "the high byte of the ORA at $1D51, rewritten as the game runs, by $1CE0, $1D10" }, { "address": 7509, "type": "line", "text": "the low byte of the STA at $1D54, rewritten as the game runs, by $1B4D" }, { "address": 7510, "type": "line", "text": "the high byte of the STA at $1D54, rewritten as the game runs, by $1B56" }, { "address": 7513, "type": "line", "text": "the high byte of the LDA at $1D57, rewritten as the game runs, by $1D38" }, { "address": 7515, "type": "line", "text": "the low byte of the LDX at $1D5A, rewritten as the game runs, by $1C99" }, { "address": 7516, "type": "line", "text": "the high byte of the LDX at $1D5A, rewritten as the game runs, by $1CA7" }, { "address": 7519, "type": "line", "text": "the high byte of the ORA at $1D5D, rewritten as the game runs, by $1D28" }, { "address": 7521, "type": "line", "text": "the low byte of the ORA at $1D60, rewritten as the game runs, by $1B78" }, { "address": 7522, "type": "line", "text": "the high byte of the ORA at $1D60, rewritten as the game runs, by $1B81" }, { "address": 7524, "type": "line", "text": "the low byte of the ORA at $1D63, rewritten as the game runs, by $1CEC, $1D05" }, { "address": 7525, "type": "line", "text": "the high byte of the ORA at $1D63, rewritten as the game runs, by $1CF7, $1D13" }, { "address": 7527, "type": "line", "text": "the low byte of the STA at $1D66, rewritten as the game runs, by $1B7B" }, { "address": 7528, "type": "line", "text": "the high byte of the STA at $1D66, rewritten as the game runs, by $1B84" }, { "address": 7570, "type": "line", "text": "the low byte of the LDX at $1D91, rewritten as the game runs, by $1C7F" }, { "address": 7571, "type": "line", "text": "the high byte of the LDX at $1D91, rewritten as the game runs, by $1C8D" }, { "address": 7574, "type": "line", "text": "the high byte of the LDA at $1D94, rewritten as the game runs, by $1D2B" }, { "address": 7576, "type": "line", "text": "the low byte of the ORA at $1D97, rewritten as the game runs, by $1BA9" }, { "address": 7577, "type": "line", "text": "the high byte of the ORA at $1D97, rewritten as the game runs, by $1BB4" }, { "address": 7579, "type": "line", "text": "the low byte of the ORA at $1D9A, rewritten as the game runs, by $1CD8, $1D08" }, { "address": 7580, "type": "line", "text": "the high byte of the ORA at $1D9A, rewritten as the game runs, by $1CE3, $1D16" }, { "address": 7582, "type": "line", "text": "the low byte of the STA at $1D9D, rewritten as the game runs, by $1BAC" }, { "address": 7583, "type": "line", "text": "the high byte of the STA at $1D9D, rewritten as the game runs, by $1BB7" }, { "address": 7586, "type": "line", "text": "the high byte of the LDA at $1DA0, rewritten as the game runs, by $1D3B" }, { "address": 7588, "type": "line", "text": "the low byte of the LDX at $1DA3, rewritten as the game runs, by $1C9C" }, { "address": 7589, "type": "line", "text": "the high byte of the LDX at $1DA3, rewritten as the game runs, by $1CAA" }, { "address": 7592, "type": "line", "text": "the high byte of the ORA at $1DA6, rewritten as the game runs, by $1D2E" }, { "address": 7594, "type": "line", "text": "the low byte of the ORA at $1DA9, rewritten as the game runs, by $1BDC" }, { "address": 7595, "type": "line", "text": "the high byte of the ORA at $1DA9, rewritten as the game runs, by $1BE7" }, { "address": 7597, "type": "line", "text": "the low byte of the ORA at $1DAC, rewritten as the game runs, by $1CEF, $1D0B" }, { "address": 7598, "type": "line", "text": "the high byte of the ORA at $1DAC, rewritten as the game runs, by $1CFA, $1D19" }, { "address": 7600, "type": "line", "text": "the low byte of the STA at $1DAF, rewritten as the game runs, by $1BDF" }, { "address": 7601, "type": "line", "text": "the high byte of the STA at $1DAF, rewritten as the game runs, by $1BEA" }, { "address": 7604, "type": "line", "text": "the operand of the CPY at $1DB3, rewritten as the game runs, by $1D7F, $1D89" }, { "address": 7607, "type": "line", "text": "this opcode is rewritten by $1D84 and $1D8E: NOP lets the loop below draw a third row of the lemming, RTS ends the drawing after two" }, { "address": 7609, "type": "line", "text": "the low byte of the LDX at $1DB8, rewritten as the game runs, by $1C82" }, { "address": 7610, "type": "line", "text": "the high byte of the LDX at $1DB8, rewritten as the game runs, by $1C90" }, { "address": 7613, "type": "line", "text": "the high byte of the LDA at $1DBB, rewritten as the game runs, by $1D31" }, { "address": 7615, "type": "line", "text": "the low byte of the ORA at $1DBE, rewritten as the game runs, by $1C0F" }, { "address": 7616, "type": "line", "text": "the high byte of the ORA at $1DBE, rewritten as the game runs, by $1C1A" }, { "address": 7618, "type": "line", "text": "the low byte of the STA at $1DC1, rewritten as the game runs, by $1C12" }, { "address": 7619, "type": "line", "text": "the high byte of the STA at $1DC1, rewritten as the game runs, by $1C1D" }, { "address": 7622, "type": "line", "text": "the high byte of the LDA at $1DC4, rewritten as the game runs, by $1D3E" }, { "address": 7624, "type": "line", "text": "the low byte of the LDX at $1DC7, rewritten as the game runs, by $1C9F" }, { "address": 7625, "type": "line", "text": "the high byte of the LDX at $1DC7, rewritten as the game runs, by $1CAD" }, { "address": 7628, "type": "line", "text": "the high byte of the ORA at $1DCA, rewritten as the game runs, by $1D34" }, { "address": 7630, "type": "line", "text": "the low byte of the ORA at $1DCD, rewritten as the game runs, by $1C42" }, { "address": 7631, "type": "line", "text": "the high byte of the ORA at $1DCD, rewritten as the game runs, by $1C4D" }, { "address": 7633, "type": "line", "text": "the low byte of the STA at $1DD0, rewritten as the game runs, by $1C45" }, { "address": 7634, "type": "line", "text": "the high byte of the STA at $1DD0, rewritten as the game runs, by $1C50" }, { "address": 7637, "type": "line", "text": "the operand of the CPY at $1DD4, rewritten as the game runs, by $1D7A" }, { "address": 7641, "type": "line", "text": "the trap doors: a timer driven by the release rate ($05B8 + $0595 from $4FE8) lets the next lemming out; the first time it plays sounds 1 and 2. Each new lemming starts at the next entrance in the level header ($E06C/$E06D X, $E06E Y; three bytes each, $FF ends the list), with the direction from $E055 (toggled every lemming when $E054 is set), and counts as out ($158F)" }, { "address": 7786, "type": "line", "text": "low bytes of the 21 action handlers, by action number (the low five bits of $0424)" }, { "address": 7807, "type": "line", "text": "the action handlers' addresses, high bytes (21)" }, { "address": 7828, "type": "line", "text": "one pass of one lemming: its action and flags into $05C6/$05C7, the terrain pointers set for its position ($287E); unless paused, a level with deadly ground ($E07C) checks it ($2E07, result 2: action $13, sound $1E), then its action's handler runs (the JMP at $2010, operand from $1E6A/$1E7F); then the handler's step moves it in X ($2E56) and Y ($2E68). A lemming that leaves the level at either side or below line $A9 is gone (sound $1E); one that reaches the exit (within 9 lines and 2 columns of it) starts action 4 (sound $1B). Last, the animation frame advances" }, { "address": 8066, "type": "line", "text": "the operand of the SBC at $1F81, rewritten as the game runs, by $1376" }, { "address": 8078, "type": "line", "text": "the operand of the SBC at $1F8D, rewritten as the game runs, by $1367" }, { "address": 8086, "type": "line", "text": "the operand of the SBC at $1F95, rewritten as the game runs, by $136D" }, { "address": 8156, "type": "line", "text": "the operand of the ORA at $1FDB, rewritten as the game runs, by $1FC2" }, { "address": 8179, "type": "line", "text": "before walking on, on a level with water ($E07D bit 7): a lemming within 8 lines of the water's surface in its column ($2D7B) takes the level's drowning action from $2D7A, with sound $1E; otherwise the walk ($2013)" }, { "address": 8209, "type": "line", "text": "the low byte of the JMP at $2010, rewritten as the game runs, by $1EE4" }, { "address": 8210, "type": "line", "text": "the high byte of the JMP at $2010, rewritten as the game runs, by $1EEA" }, { "address": 8211, "type": "line", "text": "action 8/9, walking: tests the terrain ahead at rising heights ($28E8): a step up of 1-5 lines is climbed, a wall turns it round unless it is a climber (bit 1 of $0456), which starts climbing (action $10); no ground below starts a fall (action 2, $20B3)" }, { "address": 8340, "type": "line", "text": "action 2, falling, keeping the direction" }, { "address": 8365, "type": "line", "text": "tests for ground under the lemming over two columns and three rows ($28E8): Y returns $0B when none was found at any of them, the row it was found at otherwise" }, { "address": 8371, "type": "line", "text": "$20AD for the column in A and the next one" }, { "address": 8384, "type": "line", "text": "the operand of the LDX at $20BF, rewritten as the game runs, by $20AD, $20B3" }, { "address": 8393, "type": "line", "text": "the operand of the LDX at $20C8, rewritten as the game runs, by $20B9" }, { "address": 8446, "type": "line", "text": "an entry inside the BIT at $20FD: entered here, its operand runs as LDA #$01; reached by $20D9 BNE, $20E3 BNE, while the way through the BIT skips it" }, { "address": 8449, "type": "line", "text": "an entry inside the BIT at $2100: entered here, its operand runs as LDA #$02; reached by $20ED BNE, $20F7 BNE, while the way through the BIT skips it" }, { "address": 8452, "type": "line", "text": "an entry inside the BIT at $2103: entered here, its operand runs as LDA #$03; reached by $20F9 BEQ, while the way through the BIT skips it" }, { "address": 8456, "type": "line", "text": "the operand of the ADC at $2107, rewritten as the game runs, by $20BC" }, { "address": 8459, "type": "line", "text": "action 2: one step down a pass while there is no ground; a floater (bit 2 of $0456) opens its umbrella after two steps (action 1); landing after more than $15 steps is fatal (action 3, sound $1E), otherwise it walks on" }, { "address": 8539, "type": "line", "text": "an entry inside the BIT at $215A: entered here, its operand runs as LDA #$08; reached by $2156 BPL, while the way through the BIT skips it" }, { "address": 8544, "type": "line", "text": "starts the lemming's new action at its first frame: clears the frame bits of $0456 and the counter in $051E" }, { "address": 8564, "type": "line", "text": "action 0, blocking: writes the blocker's height into the blocker map at $7E00 for the columns it covers ($21C8); when the ground goes from under it, it leaves the map and falls" }, { "address": 8593, "type": "line", "text": "the high byte of the LDA at $218F, rewritten as the game runs, by $21B4, $21D7" }, { "address": 8642, "type": "line", "text": "writes A into the blocker map at the lemming's column, the STA's operand set by $21C8: the blocker's height, or $FF to clear it" }, { "address": 8644, "type": "line", "text": "the high byte of the STA at $21C2, rewritten as the game runs, by $21B7, $21D4" }, { "address": 8646, "type": "line", "text": "the operand of the LDY at $21C5, rewritten as the game runs, by $2185" }, { "address": 8648, "type": "line", "text": "points the blocker map's operands at the lemming's column: $7E00 + X + 3" }, { "address": 8680, "type": "line", "text": "is there terrain right in front at the lemming's height? ($80 when the column ahead is filled between its height and 16 lines above)" }, { "address": 8683, "type": "line", "text": "an entry inside the BIT at $21EA: entered here, its operand runs as LDA #$02; reached by $2013 JSR, $2624 JSR, while the way through the BIT skips it" }, { "address": 8723, "type": "line", "text": "the operand of the ADC at $2212, rewritten as the game runs, by $21ED" }, { "address": 8727, "type": "line", "text": "the high byte of the SBC at $2215, rewritten as the game runs, by $220B" }, { "address": 8740, "type": "line", "text": "action 3, the splat: the animation plays to its end ($78), then the lemming is gone" }, { "address": 8771, "type": "line", "text": "action 1, floating: falls slowly with the umbrella; on the ground it walks on" }, { "address": 8801, "type": "line", "text": "the operand of the LDY at $2260, rewritten as the game runs, by $2252" }, { "address": 8821, "type": "line", "text": "an entry inside the BIT at $2274: entered here, its operand runs as LDA #$08; reached by $2270 BPL, while the way through the BIT skips it" }, { "address": 8829, "type": "line", "text": "action 4, walking into the exit: at the end of the animation ($38) it is gone and counted as saved ($2A1A, $15A8)" }, { "address": 8856, "type": "line", "text": "draws the explosion of a bomber into four rows of fresh characters around its centre ($06E5-$06E8), once" }, { "address": 8911, "type": "line", "text": "one row of the bomber's blast picture: works out where it falls on the screen and, when it is in view, builds it into four fresh characters ORed from the blast's shape ($7B10/$7B30, by the fine scroll) and puts them on the hidden screen" }, { "address": 8931, "type": "line", "text": "the operand of the SBC at $22E2, rewritten as the game runs, by $22DB" }, { "address": 8938, "type": "line", "text": "the operand of the LDA at $22E9, rewritten as the game runs, by $22D4" }, { "address": 8940, "type": "line", "text": "the operand of the SBC at $22EB, rewritten as the game runs, by $22A5" }, { "address": 8999, "type": "line", "text": "the high byte of the LDA at $2325, rewritten as the game runs, by $13B9" }, { "address": 9006, "type": "line", "text": "the low byte of the LDY at $232D, rewritten as the game runs, by $230C" }, { "address": 9010, "type": "line", "text": "the high byte of the LDA at $2330, rewritten as the game runs, by $2319" }, { "address": 9012, "type": "line", "text": "the low byte of the LDY at $2333, rewritten as the game runs, by $2301" }, { "address": 9016, "type": "line", "text": "the high byte of the ORA at $2336, rewritten as the game runs, by $2315" }, { "address": 9018, "type": "line", "text": "the low byte of the STA at $2339, rewritten as the game runs, by $2322" }, { "address": 9019, "type": "line", "text": "the high byte of the STA at $2339, rewritten as the game runs, by $2328" }, { "address": 9033, "type": "line", "text": "the operand of the ADC at $2348, rewritten as the game runs, by $22F6" }, { "address": 9044, "type": "line", "text": "the low byte of the LDA at $2353, rewritten as the game runs, by $13CE" }, { "address": 9045, "type": "line", "text": "the high byte of the LDA at $2353, rewritten as the game runs, by $13DD" }, { "address": 9067, "type": "line", "text": "the low byte of the LDA at $236A, rewritten as the game runs, by $234A" }, { "address": 9068, "type": "line", "text": "the high byte of the LDA at $236A, rewritten as the game runs, by $2358" }, { "address": 9075, "type": "line", "text": "the low byte of the STA at $2372, rewritten as the game runs, by $234D" }, { "address": 9076, "type": "line", "text": "the high byte of the STA at $2372, rewritten as the game runs, by $235B" }, { "address": 9080, "type": "line", "text": "the low byte of the STA at $2377, rewritten as the game runs, by $2350" }, { "address": 9081, "type": "line", "text": "the high byte of the STA at $2377, rewritten as the game runs, by $2362" }, { "address": 9097, "type": "line", "text": "the four shift positions of the blast picture's characters, by the explosion's pixel column ($2312)" }, { "address": 9101, "type": "line", "text": "action 20: becomes an exploding lemming (action 5)" }, { "address": 9117, "type": "line", "text": "action 5: at frame $68 takes the lemming off the blocker map, records the blast's centre and plays sound $1A; at $78 it is gone and the blast is cut out of the terrain, eleven rows from the table at $2E78/$2E81 ($2930), except steel ($2E07)" }, { "address": 9258, "type": "line", "text": "the operand of the LDA at $2429, rewritten as the game runs, by $2410, $2426" }, { "address": 9290, "type": "line", "text": "action 6, digging down: removes a row of terrain under the lemming each frame of its stroke ($248C, cells from $3F98/$3FA8/$3FB8); steel stops it ($2E07: back to walking); with nothing left below it falls" }, { "address": 9315, "type": "line", "text": "the operand of the LDX at $2462, rewritten as the game runs, by $2454" }, { "address": 9342, "type": "line", "text": "an entry inside the BIT at $247D: entered here, its operand runs as LDY #$0A; reached by $2476 BNE, while the way through the BIT skips it" }, { "address": 9356, "type": "line", "text": "removes the terrain cells of one dig stroke, counting the pixels removed into $051E" }, { "address": 9442, "type": "line", "text": "two bytes after dig_rows' RTS at $24E1 that no path reaches" }, { "address": 9444, "type": "line", "text": "next cell of the dig stroke" }, { "address": 9474, "type": "line", "text": "action 11, building the other way: as $259B" }, { "address": 9544, "type": "line", "text": "an entry inside the BIT at $2547: entered here, its operand runs as LDA #$89; reached by $250A BEQ, while the way through the BIT skips it" }, { "address": 9547, "type": "line", "text": "an entry inside the BIT at $254A: entered here, its operand runs as LDA #$08; reached by $251D BEQ, $252F BNE, $2534 BNE, while the way through the BIT skips it" }, { "address": 9561, "type": "line", "text": "plays sound $1C from the builder's ninth brick on ($051E 9 or more), the warning that it is about to run out" }, { "address": 9588, "type": "line", "text": "action 7: the builder out of bricks shrugs, then walks on" }, { "address": 9620, "type": "line", "text": "the builder's ground test: two columns from column 5 ($20B3)" }, { "address": 9627, "type": "line", "text": "action 10, building: lays a brick a stroke ($2603 sets the brick's pixels), climbs it; stops at a wall ahead ($21E8), when its head would hit terrain ($25F2, $25F9) or after the twelfth brick (action 7, the shrug)" }, { "address": 9697, "type": "line", "text": "an entry inside the BIT at $25E0: entered here, its operand runs as LDA #$08; reached by $25A3 BEQ, while the way through the BIT skips it" }, { "address": 9700, "type": "line", "text": "an entry inside the BIT at $25E3: entered here, its operand runs as LDA #$89; reached by $25B6 BEQ, $25C8 BNE, $25CD BNE, while the way through the BIT skips it" }, { "address": 9714, "type": "line", "text": "is there terrain at the builder's head? ($28E8 at 8, $0E)" }, { "address": 9721, "type": "line", "text": "is there terrain where the builder steps? ($28E8 at 7, 8)" }, { "address": 9724, "type": "line", "text": "an entry inside the BIT at $25FB: entered here, its operand runs as LDX #$08; reached by $252C JSR, $25C5 JSR, while the way through the BIT skips it" }, { "address": 9731, "type": "line", "text": "sets the pixels of one brick in the terrain, 12 wide ($2927)" }, { "address": 9743, "type": "line", "text": "an entry inside the BIT at $260E: entered here, its operand runs as LDX #$08; reached by $2609 JSR, while the way through the BIT skips it" }, { "address": 9752, "type": "line", "text": "sets one row of the brick's pixels" }, { "address": 9755, "type": "line", "text": "an entry inside the BIT at $261A: entered here, its operand runs as LDX #$07; reached by $2606 JSR, while the way through the BIT skips it" }, { "address": 9764, "type": "line", "text": "actions 12/13, bashing: removes terrain in front a stroke at a time ($26C2) unless steel; with nothing left in front, or a blocker ahead, it walks on" }, { "address": 9857, "type": "line", "text": "the operand of the LDX at $2680, rewritten as the game runs, by $2640" }, { "address": 9883, "type": "line", "text": "sets bit 6 of the lemming's counter ($051E)" }, { "address": 9895, "type": "line", "text": "returns the low six bits of the lemming's counter ($051E) and clears them" }, { "address": 9911, "type": "line", "text": "adds A to the lemming's counter ($051E)" }, { "address": 9922, "type": "line", "text": "removes up to three rows of terrain for one frame of the basher's swing, from $3FC4/$3FCD/$3FD6; returns $FF when steel stops it" }, { "address": 9975, "type": "line", "text": "removes the terrain pixel at ($B0, $B2) and the one below it, counting them in $BA; returns $FF instead when the cell is steel or a one-way wall facing the lemming ($2E07, $06EC)" }, { "address": 10037, "type": "line", "text": "actions 14/15, mining: removes a diagonal of terrain a stroke ($2925), from the tables at $7DAA/$7DC5; steel stops it, an empty floor makes it fall" }, { "address": 10123, "type": "line", "text": "the operand of the LDY at $278A, rewritten as the game runs, by $275B" }, { "address": 10126, "type": "line", "text": "the operand of the CPY at $278D, rewritten as the game runs, by $2755" }, { "address": 10142, "type": "line", "text": "the operand of the LDX at $279D, rewritten as the game runs, by $274B" }, { "address": 10186, "type": "line", "text": "actions 16/17, climbing: up a line a pass while the wall goes on; at the top it steps over (action 8/9); terrain overhead makes it fall back (action 2)" }, { "address": 10287, "type": "line", "text": "an entry inside the BIT at $282E: entered here, its operand runs as LDY #$00; reached by $27D6 BMI, $281B BEQ, while the way through the BIT skips it" }, { "address": 10318, "type": "line", "text": "action 18: the animation plays to $78, then the lemming is gone" }, { "address": 10342, "type": "line", "text": "action 19, killed by the ground ($E07C, $1ECE): the animation plays to $38, then the lemming is gone" }, { "address": 10366, "type": "line", "text": "for lemming X, writes its position and direction into the operands of the terrain routines ($28E8, $2E07): the column, the row and which way it faces" }, { "address": 10472, "type": "line", "text": "is there terrain at offset X, Y from the lemming? Turns the offset into a byte of the terrain bitmap kept as sprite shapes ($4A00/$4C00/$4E00 by X, $4800/$4900 by Y) and masks the pixel ($48C4); non-zero when filled" }, { "address": 10473, "type": "line", "text": "the low byte of the LDA at $28E8, rewritten as the game runs, by $28C8, $28D9" }, { "address": 10474, "type": "line", "text": "the high byte of the LDA at $28E8, rewritten as the game runs, by $28D0, $28E1" }, { "address": 10476, "type": "line", "text": "$28E8 with the table index already in X" }, { "address": 10479, "type": "line", "text": "the low byte of the ADC at $28EE, rewritten as the game runs, by $28A2" }, { "address": 10480, "type": "line", "text": "the high byte of the ADC at $28EE, rewritten as the game runs, by $2896" }, { "address": 10483, "type": "line", "text": "the low byte of the LDA at $28F2, rewritten as the game runs, by $21A3, $289C" }, { "address": 10484, "type": "line", "text": "the high byte of the LDA at $28F2, rewritten as the game runs, by $2888" }, { "address": 10487, "type": "line", "text": "the low byte of the ADC at $28F6, rewritten as the game runs, by $28B3" }, { "address": 10493, "type": "line", "text": "the low byte of the LDA at $28FC, rewritten as the game runs, by $289F" }, { "address": 10494, "type": "line", "text": "the high byte of the LDA at $28FC, rewritten as the game runs, by $288F" }, { "address": 10496, "type": "line", "text": "the low byte of the ADC at $28FF, rewritten as the game runs, by $28B6" }, { "address": 10506, "type": "line", "text": "the low byte of the LDA at $2909, rewritten as the game runs, by $28F9" }, { "address": 10507, "type": "line", "text": "the high byte of the LDA at $2909, rewritten as the game runs, by $2902" }, { "address": 10509, "type": "line", "text": "the low byte of the AND at $290C, rewritten as the game runs, by $28AA" }, { "address": 10512, "type": "line", "text": "a routine no code calls: reads a terrain pixel through terrain_at ($28E8) and shifts it down to the low bits, giving 0 for a value of 3" }, { "address": 10533, "type": "line", "text": "clears one terrain pixel at an offset from the lemming ($2930 with A = 0)" }, { "address": 10535, "type": "line", "text": "sets one terrain pixel to the value in A" }, { "address": 10544, "type": "line", "text": "writes a terrain pixel at the address $28E8 found, in the sprite shapes at $8000-$B3FF and, when the column is in view, also in the shown copy at $6000-$6FFF; counts filled pixels it changes in $BA" }, { "address": 10629, "type": "line", "text": "an entry inside the BIT at $2984: entered here, its operand runs as LDA #$60; reached by $297C BCC, $2980 BCS, while the way through the BIT skips it" }, { "address": 10637, "type": "line", "text": "the operand of the ADC at $298C, rewritten as the game runs, by $28AD" }, { "address": 10643, "type": "line", "text": "the operand of the ADC at $2992, rewritten as the game runs, by $2927, $2932" }, { "address": 10649, "type": "line", "text": "the operand of the CMP at $2998, rewritten as the game runs, by $293C" }, { "address": 10653, "type": "line", "text": "the low byte of the LDA at $299C, rewritten as the game runs, by $2960" }, { "address": 10654, "type": "line", "text": "the high byte of the LDA at $299C, rewritten as the game runs, by $294D" }, { "address": 10662, "type": "line", "text": "the low byte of the STA at $29A5, rewritten as the game runs, by $295D" }, { "address": 10663, "type": "line", "text": "the high byte of the STA at $29A5, rewritten as the game runs, by $294A" }, { "address": 10664, "type": "line", "text": "this opcode is rewritten by $2987: LDA when the pixel's column is in view, so the shown copy at $60xx gets it too, RTS when it is not" }, { "address": 10665, "type": "line", "text": "the low byte of the LDA at $29A8, rewritten as the game runs, by $2963" }, { "address": 10666, "type": "line", "text": "the high byte of the LDA at $29A8, rewritten as the game runs, by $2954" }, { "address": 10674, "type": "line", "text": "the low byte of the STA at $29B1, rewritten as the game runs, by $2966" }, { "address": 10675, "type": "line", "text": "the high byte of the STA at $29B1, rewritten as the game runs, by $2957" }, { "address": 10677, "type": "line", "text": "the panel's line above the icons: the clock and counts at $CB39-$CB42 as digits, and the name of the lemming under the cursor from $121D" }, { "address": 10727, "type": "line", "text": "the operand of the ORA at $29E6, rewritten as the game runs, by $29D6" }, { "address": 10744, "type": "line", "text": "plays sound effect A on voice 0 or 2 by turns (the LDX at $2A03 alternates), through $3003, unless the music is on ($CB47 bit 7)" }, { "address": 10756, "type": "line", "text": "the operand of the LDX at $2A03, rewritten as the game runs, by $2A10" }, { "address": 10758, "type": "line", "text": "an entry inside the BIT at $2A05: entered here, its operand runs as LDX #$02; reached by $2A01 BMI, while the way through the BIT skips it" }, { "address": 10778, "type": "line", "text": "a lemming saved: adds the level's share of one lemming, four decimal digits at $E056-$E059 (10.00 for a level of 10), into the percentage at $CB40-$CB44, and one to the count saved at $CB45" }, { "address": 10807, "type": "line", "text": "every second pass ($059A gains $80) asks for the next frame of the level's animated objects ($0599)" }, { "address": 10824, "type": "line", "text": "the level's animated objects ($E07B of them; type and flags $7080, column $7100, frame count $0300, frame $05DC): when it is time, steps each object's frame (a paused game holds them), and draws the ones in view by ORing their frame ($7280/$7300) into the characters of the shown copy ($7180/$7200, $60xx). An object of type $A9 plays sound $1F the first time and starts the music ($2E51)" }, { "address": 10845, "type": "line", "text": "the low byte of the LDA at $2A5C, rewritten as the game runs, by $1008" }, { "address": 10903, "type": "line", "text": "the low byte of the LDA at $2A96, rewritten as the game runs, by $100B" }, { "address": 10942, "type": "line", "text": "the operand of the LDX at $2ABD, rewritten as the game runs, by $2AAB" }, { "address": 10944, "type": "line", "text": "the low byte of the LDA at $2ABF, rewritten as the game runs, by $1017" }, { "address": 10948, "type": "line", "text": "the operand of the SBC at $2AC3, rewritten as the game runs, by $2A51" }, { "address": 10964, "type": "line", "text": "the low byte of the LDA at $2AD3, rewritten as the game runs, by $1035" }, { "address": 10970, "type": "line", "text": "the low byte of the LDA at $2AD9, rewritten as the game runs, by $1029" }, { "address": 10976, "type": "line", "text": "the low byte of the LDA at $2ADF, rewritten as the game runs, by $102F" }, { "address": 10982, "type": "line", "text": "the low byte of the LDA at $2AE5, rewritten as the game runs, by $101D" }, { "address": 10991, "type": "line", "text": "the low byte of the LDA at $2AEE, rewritten as the game runs, by $1023" }, { "address": 11008, "type": "line", "text": "the low byte of the LDA at $2AFF, rewritten as the game runs, by $2AEB" }, { "address": 11009, "type": "line", "text": "the high byte of the LDA at $2AFF, rewritten as the game runs, by $2AF1" }, { "address": 11011, "type": "line", "text": "the low byte of the ORA at $2B02, rewritten as the game runs, by $2ADC" }, { "address": 11012, "type": "line", "text": "the high byte of the ORA at $2B02, rewritten as the game runs, by $2AE2" }, { "address": 11014, "type": "line", "text": "the low byte of the STA at $2B05, rewritten as the game runs, by $2AE8" }, { "address": 11015, "type": "line", "text": "the high byte of the STA at $2B05, rewritten as the game runs, by $2AF8" }, { "address": 11021, "type": "line", "text": "the operand of the CPX at $2B0C, rewritten as the game runs, by $2AD6" }, { "address": 11030, "type": "line", "text": "an entry inside the BIT at $2B15: entered here, its operand runs as LDA #$00; reached by $2AC5 BCC, $2AC9 BCS, while the way through the BIT skips it" }, { "address": 11037, "type": "line", "text": "the operand of the CPX at $2B1C, rewritten as the game runs, by $2A57" }, { "address": 11049, "type": "line", "text": "low bytes of the water's animation shapes, four frames for each kind of water ($E07E)" }, { "address": 11053, "type": "line", "text": "the same for the second shape" }, { "address": 11073, "type": "line", "text": "high bytes of the water's shapes" }, { "address": 11077, "type": "line", "text": "high bytes of the second shape" }, { "address": 11097, "type": "line", "text": "the pixel shift of the water's shapes for the fine scroll" }, { "address": 11101, "type": "line", "text": "the opcodes written into the water drawing loop for the two scroll phases" }, { "address": 11102, "type": "line", "text": "the second byte of water_ops, read as its own table by the water drawing set-up ($2C6F)" }, { "address": 11103, "type": "line", "text": "the third byte of water_ops, read by $2C75" }, { "address": 11104, "type": "line", "text": "the fourth and fifth bytes of water_ops, read by $2C7B" }, { "address": 11106, "type": "line", "text": "the sixth byte of water_ops, read by $2C81" }, { "address": 11107, "type": "line", "text": "the seventh byte, read by $2C87" }, { "address": 11108, "type": "line", "text": "the eighth byte, read by $2C8D" }, { "address": 11109, "type": "line", "text": "the ninth and tenth bytes, read by $2C93" }, { "address": 11111, "type": "line", "text": "the water's animation frame, 0-3, advanced every pass unless paused" }, { "address": 11112, "type": "line", "text": "the offsets of the rows the water surface covers" }, { "address": 11119, "type": "line", "text": "fills the water below its surface in one column with the water character ($2D70)" }, { "address": 11142, "type": "line", "text": "the operand of the LDA at $2B85, rewritten as the game runs, by $2B7A" }, { "address": 11144, "type": "line", "text": "the low byte of the STA at $2B87, rewritten as the game runs, by $2D0A" }, { "address": 11145, "type": "line", "text": "the high byte of the STA at $2B87, rewritten as the game runs, by $2D1D" }, { "address": 11150, "type": "line", "text": "the low byte of the STA at $2B8D, rewritten as the game runs, by $2D0D" }, { "address": 11151, "type": "line", "text": "the high byte of the STA at $2B8D, rewritten as the game runs, by $2D24" }, { "address": 11156, "type": "line", "text": "the operand of the LDX at $2B93, rewritten as the game runs, by $2CF8" }, { "address": 11158, "type": "line", "text": "on a level with water ($E07D): draws this pass's frame of the water surface into characters $F4-$FB of the character set ($57A0-$57DF), from the shapes for the water's kind ($E07E) and the frame ($2B67), shifted for the fine scroll; then puts the surface characters ($FA) and the water below on the hidden screen along the columns in view" }, { "address": 11317, "type": "line", "text": "the operand of the LDA at $2C34, rewritten as the game runs, by $2BBA" }, { "address": 11420, "type": "line", "text": "the low byte of the LDY at $2C9B, rewritten as the game runs, by $2BFD" }, { "address": 11421, "type": "line", "text": "the high byte of the LDY at $2C9B, rewritten as the game runs, by $2C0C" }, { "address": 11424, "type": "line", "text": "the high byte of the LDA at $2C9E, rewritten as the game runs, by $2C3D" }, { "address": 11426, "type": "line", "text": "the low byte of the STA at $2CA1, rewritten as the game runs, by $2C6C" }, { "address": 11427, "type": "line", "text": "the high byte of the STA at $2CA1, rewritten as the game runs, by $2BD7" }, { "address": 11430, "type": "line", "text": "the high byte of the LDA at $2CA4, rewritten as the game runs, by $2C50" }, { "address": 11432, "type": "line", "text": "the low byte of the LDY at $2CA7, rewritten as the game runs, by $2C06" }, { "address": 11433, "type": "line", "text": "the high byte of the LDY at $2CA7, rewritten as the game runs, by $2C14" }, { "address": 11436, "type": "line", "text": "the high byte of the ORA at $2CAA, rewritten as the game runs, by $2C40" }, { "address": 11438, "type": "line", "text": "the low byte of the STA at $2CAD, rewritten as the game runs, by $2C72" }, { "address": 11439, "type": "line", "text": "the high byte of the STA at $2CAD, rewritten as the game runs, by $2BDA" }, { "address": 11442, "type": "line", "text": "the high byte of the LDA at $2CB0, rewritten as the game runs, by $2C53" }, { "address": 11444, "type": "line", "text": "the low byte of the LDY at $2CB3, rewritten as the game runs, by $2C00" }, { "address": 11445, "type": "line", "text": "the high byte of the LDY at $2CB3, rewritten as the game runs, by $2C0F" }, { "address": 11448, "type": "line", "text": "the high byte of the ORA at $2CB6, rewritten as the game runs, by $2C43" }, { "address": 11450, "type": "line", "text": "the low byte of the STA at $2CB9, rewritten as the game runs, by $2C78" }, { "address": 11451, "type": "line", "text": "the high byte of the STA at $2CB9, rewritten as the game runs, by $2BDD" }, { "address": 11454, "type": "line", "text": "the high byte of the LDA at $2CBC, rewritten as the game runs, by $2C56" }, { "address": 11456, "type": "line", "text": "the low byte of the STA at $2CBF, rewritten as the game runs, by $2C7E" }, { "address": 11457, "type": "line", "text": "the high byte of the STA at $2CBF, rewritten as the game runs, by $2BE0" }, { "address": 11459, "type": "line", "text": "the low byte of the LDY at $2CC2, rewritten as the game runs, by $2C1A" }, { "address": 11460, "type": "line", "text": "the high byte of the LDY at $2CC2, rewritten as the game runs, by $2C29" }, { "address": 11463, "type": "line", "text": "the high byte of the LDA at $2CC5, rewritten as the game runs, by $2C46" }, { "address": 11465, "type": "line", "text": "the low byte of the STA at $2CC8, rewritten as the game runs, by $2C84" }, { "address": 11466, "type": "line", "text": "the high byte of the STA at $2CC8, rewritten as the game runs, by $2BE3" }, { "address": 11469, "type": "line", "text": "the high byte of the LDA at $2CCB, rewritten as the game runs, by $2C59" }, { "address": 11471, "type": "line", "text": "the low byte of the LDY at $2CCE, rewritten as the game runs, by $2C23" }, { "address": 11472, "type": "line", "text": "the high byte of the LDY at $2CCE, rewritten as the game runs, by $2C31" }, { "address": 11475, "type": "line", "text": "the high byte of the ORA at $2CD1, rewritten as the game runs, by $2C49" }, { "address": 11477, "type": "line", "text": "the low byte of the STA at $2CD4, rewritten as the game runs, by $2C8A" }, { "address": 11478, "type": "line", "text": "the high byte of the STA at $2CD4, rewritten as the game runs, by $2BE6" }, { "address": 11481, "type": "line", "text": "the high byte of the LDA at $2CD7, rewritten as the game runs, by $2C5C" }, { "address": 11483, "type": "line", "text": "the low byte of the LDY at $2CDA, rewritten as the game runs, by $2C1D" }, { "address": 11484, "type": "line", "text": "the high byte of the LDY at $2CDA, rewritten as the game runs, by $2C2C" }, { "address": 11487, "type": "line", "text": "the high byte of the ORA at $2CDD, rewritten as the game runs, by $2C4C" }, { "address": 11489, "type": "line", "text": "the low byte of the STA at $2CE0, rewritten as the game runs, by $2C90" }, { "address": 11490, "type": "line", "text": "the high byte of the STA at $2CE0, rewritten as the game runs, by $2BE9" }, { "address": 11493, "type": "line", "text": "the high byte of the LDA at $2CE3, rewritten as the game runs, by $2C5F" }, { "address": 11495, "type": "line", "text": "the low byte of the STA at $2CE6, rewritten as the game runs, by $2C96" }, { "address": 11496, "type": "line", "text": "the high byte of the STA at $2CE6, rewritten as the game runs, by $2BEC" }, { "address": 11501, "type": "line", "text": "the operand of the LDX at $2CEC, rewritten as the game runs, by $2BAF, $2BC1" }, { "address": 11505, "type": "line", "text": "the low byte of the LDA at $2CF0, rewritten as the game runs, by $103E" }, { "address": 11519, "type": "line", "text": "the low byte of the LDA at $2CFE, rewritten as the game runs, by $1047" }, { "address": 11545, "type": "line", "text": "the operand of the ORA at $2D18, rewritten as the game runs, by $2BD4" }, { "address": 11563, "type": "line", "text": "the low byte of the LDA at $2D2A, rewritten as the game runs, by $104A" }, { "address": 11573, "type": "line", "text": "the operand of the LDY at $2D34, rewritten as the game runs, by $2CFB" }, { "address": 11578, "type": "line", "text": "the low byte of the STA at $2D39, rewritten as the game runs, by $2D10" }, { "address": 11579, "type": "line", "text": "the high byte of the STA at $2D39, rewritten as the game runs, by $2D27" }, { "address": 11581, "type": "line", "text": "the operand of the LDA at $2D3C, rewritten as the game runs, by $2CF5" }, { "address": 11583, "type": "line", "text": "the low byte of the STA at $2D3E, rewritten as the game runs, by $2D07" }, { "address": 11584, "type": "line", "text": "the high byte of the STA at $2D3E, rewritten as the game runs, by $2D1A" }, { "address": 11592, "type": "line", "text": "a lemming drawn over a water character ($F4 or above): copies that character's shape into the fresh character it is drawn into" }, { "address": 11601, "type": "line", "text": "the high byte of the LDA at $2D4F, rewritten as the game runs, by $13BF" }, { "address": 11616, "type": "line", "text": "the high byte of the LDA at $2D5E, rewritten as the game runs, by $13BC" }, { "address": 11623, "type": "line", "text": "the low byte of the LDA at $2D66, rewritten as the game runs, by $2D4C" }, { "address": 11624, "type": "line", "text": "the high byte of the LDA at $2D66, rewritten as the game runs, by $2BEF, $2D52" }, { "address": 11626, "type": "line", "text": "the low byte of the STA at $2D69, rewritten as the game runs, by $2D5B" }, { "address": 11627, "type": "line", "text": "the high byte of the STA at $2D69, rewritten as the game runs, by $2D61" }, { "address": 11632, "type": "line", "text": "the character the water below the surface is drawn with (from $2D71 by the water's kind)" }, { "address": 11633, "type": "line", "text": "the fill character for each kind of water" }, { "address": 11636, "type": "line", "text": "the surface character for each kind" }, { "address": 11639, "type": "line", "text": "the action a lemming takes when it falls into each kind of water" }, { "address": 11642, "type": "line", "text": "this level's drowning action, from $2D77" }, { "address": 11643, "type": "line", "text": "on a level with water: $80 when the lemming is within 8 lines of the surface in its column, from the water map ($2D8F/$2D94 operands)" }, { "address": 11663, "type": "line", "text": "the low byte of the LDA at $2D8E, rewritten as the game runs, by $103B" }, { "address": 11668, "type": "line", "text": "the low byte of the LDA at $2D93, rewritten as the game runs, by $1044" }, { "address": 11679, "type": "line", "text": "the operand of the ADC at $2D9E, rewritten as the game runs, by $10EB" }, { "address": 11688, "type": "line", "text": "the operand of the SBC at $2DA7, rewritten as the game runs, by $2DA0" }, { "address": 11701, "type": "line", "text": "builds the row pointers of the level's map of special cells ($E08E/$E08F, $14 bytes a row) into $0550/$0564" }, { "address": 11738, "type": "line", "text": "sets $06EC to 2 or 3 by the lemming's direction, the cell kind that a one-way wall facing it has, and the map's offsets for its position" }, { "address": 11779, "type": "line", "text": "$2E07 with the X offset taken through $2FDC" }, { "address": 11780, "type": "line", "text": "the low byte of the LDA at $2E03, rewritten as the game runs, by $28CB, $28DC" }, { "address": 11781, "type": "line", "text": "the high byte of the LDA at $2E03, rewritten as the game runs, by $28D3, $28E4" }, { "address": 11783, "type": "line", "text": "the kind of map cell at an offset from the lemming: two bits per cell, four cells a byte, from the rows at $0550/$0564. 0 is plain, 1 steel; 2 and 3 are compared with $06EC by the basher and the digger, the one-way walls" }, { "address": 11792, "type": "line", "text": "the operand of the ADC at $2E0F, rewritten as the game runs, by $2DEE" }, { "address": 11795, "type": "line", "text": "the operand of the LDA at $2E12, rewritten as the game runs, by $2DF6" }, { "address": 11811, "type": "line", "text": "the operand of the ADC at $2E22, rewritten as the game runs, by $2DFF" }, { "address": 11829, "type": "line", "text": "the operand of the LDA at $2E34, rewritten as the game runs, by $2E1A" }, { "address": 11834, "type": "line", "text": "the low byte of the LDA at $2E39, rewritten as the game runs, by $2E2B" }, { "address": 11835, "type": "line", "text": "the high byte of the LDA at $2E39, rewritten as the game runs, by $2E31" }, { "address": 11857, "type": "line", "text": "bit 7 set once the music should play; the play interrupt then calls the player at $3006" }, { "address": 11858, "type": "line", "text": "how far to shift a map byte for each of its four cells" }, { "address": 11862, "type": "line", "text": "per animation step, how many pixels the lemming moves in X" }, { "address": 11880, "type": "line", "text": "per animation step, how many lines it moves in Y" }, { "address": 11896, "type": "line", "text": "the first X offset of each of the explosion's eleven rows" }, { "address": 11905, "type": "line", "text": "the last X offset of each row" }, { "address": 11936, "type": "line", "text": "high bytes of the lemmings' animation frames (with $3C00, $3D2C and $3E58)" }, { "address": 12236, "type": "line", "text": "the pixel values a builder lays, by position in the byte" }, { "address": 12252, "type": "line", "text": "the terrain tables' index for each X offset from the lemming, mirrored for a lemming facing the other way (the table's operand rewritten by $287E)" }, { "address": 12288, "type": "line", "text": "the sound driver's entry 0: silences the SID ($30A1)" }, { "address": 12291, "type": "line", "text": "entry 1: starts sequence A on voice X ($30D5): a tune's part or a sound effect" }, { "address": 12294, "type": "line", "text": "entry 2: one frame of the driver ($30FB), called by the play interrupt while the music is on" }, { "address": 12297, "type": "line", "text": "not read by the code: the driver's signature in screen codes, \"(C) 1993 JEROEN TEL / MANIACS OF NOISE\"" }, { "address": 12341, "type": "line", "text": "frames between steps of the fade-out at the end of a tune (0: no fade)" }, { "address": 12342, "type": "line", "text": "per voice: the tune asked for, which the $FC command compares ($31D6) with voice_tune_seen; only silence ($30B6) writes it, with 0. Indexed by voices 0-2 it runs to $3038, voice_tune_seen's first byte" }, { "address": 12343, "type": "line", "text": "voice_tune for X = 1, the second voice; cleared by silence ($30B9)" }, { "address": 12344, "type": "line", "text": "per voice: the tune the $FC command last chained to, so it moves on only once" }, { "address": 12345, "type": "line", "text": "voice_tune_seen for X = 1, the second voice; cleared by silence ($30BF)" }, { "address": 12346, "type": "line", "text": "counts the frames of one fade step" }, { "address": 12347, "type": "line", "text": "0 once the driver has faded out and stopped" }, { "address": 12348, "type": "line", "text": "per voice: counts down 2, 1, 0: a note's length is measured in steps of three frames" }, { "address": 12351, "type": "line", "text": "per voice: 0 at a new note, then 1 and 2 as its vibrato starts" }, { "address": 12354, "type": "line", "text": "per voice: which way the pulse width sweeps" }, { "address": 12357, "type": "line", "text": "per voice: the pulse width, low byte" }, { "address": 12360, "type": "line", "text": "per voice: the pulse width, high nybble" }, { "address": 12363, "type": "line", "text": "per voice: which half of the vibrato's cycle it is in (bit 0)" }, { "address": 12366, "type": "line", "text": "per voice: the step at which the note's gate is released" }, { "address": 12369, "type": "line", "text": "per voice: the vibrato's step in frequency, low byte (a fraction of the gap to the next note)" }, { "address": 12372, "type": "line", "text": "per voice: the same, high byte" }, { "address": 12375, "type": "line", "text": "per voice: frames left in this half of the vibrato" }, { "address": 12378, "type": "line", "text": "per voice: the step at which a slide begins" }, { "address": 12381, "type": "line", "text": "per voice: the sign of the slide: up or down" }, { "address": 12384, "type": "line", "text": "per voice: the note a $FD slide ends on" }, { "address": 12387, "type": "line", "text": "per voice: the position in the instrument's wave program" }, { "address": 12390, "type": "line", "text": "per voice: the position in the arpeggio table" }, { "address": 12393, "type": "line", "text": "per voice: the instrument's filter program and gate-off point ($37EA)" }, { "address": 12396, "type": "line", "text": "per voice: the instrument's vibrato, depth and speed ($37FA)" }, { "address": 12399, "type": "line", "text": "per voice: the instrument's pulse sweep ($380A)" }, { "address": 12402, "type": "line", "text": "per voice: the instrument's wave program flags ($381A)" }, { "address": 12405, "type": "line", "text": "per voice: the instrument number (0-63, the $C0-$FF command)" }, { "address": 12408, "type": "line", "text": "per voice: added to every instrument number (the $FA command)" }, { "address": 12411, "type": "line", "text": "per voice: the note length in steps ($80-$BF)" }, { "address": 12414, "type": "line", "text": "per voice: the arpeggio table ($60-$7F)" }, { "address": 12417, "type": "line", "text": "per voice: a counter for instruments that sweep the pitch down (wave flag bit 5)" }, { "address": 12420, "type": "line", "text": "per voice: the waveform and gate byte for $D404" }, { "address": 12423, "type": "line", "text": "per voice: $FF while the note is held, $FE to release it" }, { "address": 12426, "type": "line", "text": "per voice: the step at which the gate goes off" }, { "address": 12429, "type": "line", "text": "per voice: the instrument's attack and decay" }, { "address": 12432, "type": "line", "text": "per voice: the instrument's sustain and release" }, { "address": 12435, "type": "line", "text": "the position in the filter program (used for voice 1)" }, { "address": 12438, "type": "line", "text": "frames left of the filter program's step" }, { "address": 12441, "type": "line", "text": "the change to the cutoff each frame of the step" }, { "address": 12444, "type": "line", "text": "the filter's cutoff, high byte" }, { "address": 12445, "type": "line", "text": "the master volume, 15 down to 0 in a fade-out" }, { "address": 12446, "type": "line", "text": "the SID register offset of each voice: 0, 7, 14" }, { "address": 12448, "type": "line", "text": "the last byte of voice_offset, $0E, also read by the lemming drawing as the mask for the frame's lower half ($1D63, $1DAC)" }, { "address": 12449, "type": "line", "text": "stops the three voices' gates, clears every SID register, sets the filter's resonance ($D417 = $F2) and full volume, and resets the driver" }, { "address": 12501, "type": "line", "text": "starts sequence A on voice X: its pointer ($46), a one-step wait, the voice's gate off and its state cleared" }, { "address": 12517, "type": "line", "text": "writes to SID voice 1 control $D404 (sound driver region $30E5-$3156)" }, { "address": 12539, "type": "line", "text": "one frame of the driver: the fade-out when one is running; the volume and the filter into the SID; each voice's frequency, pulse, envelope and control from its variables; then the next step of voices 0-2 ($3175)" }, { "address": 12584, "type": "line", "text": "the operand of the ORA at $3127, rewritten as the game runs, by $30F7, $3533" }, { "address": 12661, "type": "line", "text": "one voice: counts the note's length down in steps of three frames; at its end reads the next commands ($318B), otherwise works its effects ($32F3)" }, { "address": 12683, "type": "line", "text": "reads the voice's sequence through the pointer tables at $3652/$3692: $FF jumps within it, $FE ends it (silence), $FB n repeats the next block n times, $FA n transposes the instruments, $FC chains to the next tune of the voice, $FD n,s,t slides to a note; a byte of $C0-$FF chooses an instrument, $80-$BF sets the note length, $60-$7F an arpeggio, and a byte below $60 is a note; then sets the voice's instrument up from the tables at $37AA-$381A" }, { "address": 12774, "type": "line", "text": "the operand of the ADC at $31E5, rewritten as the game runs, by $31E1" }, { "address": 13043, "type": "line", "text": "between notes: releases the gate when the note is near its end, slides the pitch ($FD), the vibrato (depth and speed from the instrument's $37FA), the wave program ($36EA/$370A), the arpeggio ($372A/$376A), the pulse-width sweep, and on voice 1 the filter program ($36D1/$36DD)" }, { "address": 13439, "type": "line", "text": "the operand of the SBC at $347E, rewritten as the game runs, by $3467, $3477" }, { "address": 13543, "type": "line", "text": "the operand of the ADC at $34E6, rewritten as the game runs, by $34DA" }, { "address": 13678, "type": "line", "text": "sets the voice's frequency for its note ($43)" }, { "address": 13680, "type": "line", "text": "sets the voice's frequency for note Y (up to $5F) from the table at $3586/$35EA" }, { "address": 13701, "type": "line", "text": "the RTS that ends set_note_y; read as entry -1 of freq_lo by the vibrato at $33CC, which takes the step between two neighbouring notes" }, { "address": 13702, "type": "line", "text": "the low bytes of the frequencies of 96 notes" }, { "address": 13801, "type": "line", "text": "the byte before freq_hi, read as entry -1 of it by the vibrato ($33D9)" }, { "address": 13802, "type": "line", "text": "the high bytes of the same" }, { "address": 13898, "type": "line", "text": "for the $FC command: the sequence to continue with, per voice and tune (two bytes each)" }, { "address": 13906, "type": "line", "text": "the low bytes of the sequences' addresses, 64 of them: the tunes' parts and the sound effects. From here to $3B79 is the level's tune file, loaded with the level (an S file, unpacked here); this one is SA" }, { "address": 13970, "type": "line", "text": "the sequences' addresses, high bytes (64)" }, { "address": 14033, "type": "line", "text": "the low bytes of the filter programs (12)" }, { "address": 14045, "type": "line", "text": "the filter programs' addresses, high bytes (12)" }, { "address": 14058, "type": "line", "text": "the low bytes of the wave programs (32): lists of control bytes for $D404, $FF jumps, $FE ends" }, { "address": 14090, "type": "line", "text": "the wave programs' addresses, high bytes (32)" }, { "address": 14122, "type": "line", "text": "the low bytes of the arpeggio tables (64): note offsets added each frame; $FF jumps, $FE ends" }, { "address": 14186, "type": "line", "text": "the arpeggio tables' addresses, high bytes (64)" }, { "address": 14250, "type": "line", "text": "the instruments (16 columns of 16): bit 7 keeps the pulse width, the low nybble starts it" }, { "address": 14266, "type": "line", "text": "each instrument's waveform and gate byte, and the pulse width's start in bits 4-6" }, { "address": 14282, "type": "line", "text": "each instrument's attack and decay" }, { "address": 14298, "type": "line", "text": "each instrument's sustain and release" }, { "address": 14314, "type": "line", "text": "each instrument's gate-off point (high nybble) and filter program (low nybble)" }, { "address": 14330, "type": "line", "text": "each instrument's vibrato: depth in the high nybble, speed in the low" }, { "address": 14346, "type": "line", "text": "each instrument's pulse sweep and release step" }, { "address": 14362, "type": "line", "text": "each instrument's wave program (bit 7 and the low five bits), pitch drop (bit 5) and arpeggio (bit 6)" }, { "address": 14378, "type": "line", "text": "the tune's sequences and the sound effects' sequences, as read_sequence reads them (notes, lengths, instruments and the $FA-$FF commands)" }, { "address": 15360, "type": "line", "text": "the low bytes of the lemmings' animation frames, 300 of them; each frame's graphics lie in $BBF0-$CB00" }, { "address": 15660, "type": "line", "text": "for each of the 300 animation frames, the high byte of its graphics' address ($BB-$CB)" }, { "address": 15872, "type": "line", "text": "for each of the water's eight lines, the pixel byte of its first shape, by the frame ($2C9B)" }, { "address": 15880, "type": "line", "text": "the same for the second shape ($2CA7)" }, { "address": 15960, "type": "line", "text": "the low bytes of the frames' second halves, for the drawing's lower rows (with $2EA0)" }, { "address": 16260, "type": "line", "text": "the colours of the panel's four sprites" }, { "address": 16264, "type": "line", "text": "their X positions" }, { "address": 16268, "type": "line", "text": "their Y positions" }, { "address": 16272, "type": "line", "text": "their pointers: shapes $D2, $CF, $D0 and $D1" }, { "address": 16276, "type": "line", "text": "for each screen, the high byte of the cursor characters $FC-$FF in its character set: $57 for $5000, $5F for $5800 ($194C)" }, { "address": 16278, "type": "line", "text": "the digger's position in the dig tables during a stroke" }, { "address": 16279, "type": "line", "text": "cells left in the digger's stroke" }, { "address": 16280, "type": "line", "text": "per frame of the dig stroke: how many cells it removes" }, { "address": 16296, "type": "line", "text": "per frame: the first of them, an index into $3FB8 and $4BF2" }, { "address": 16312, "type": "line", "text": "the cells' X offsets from the lemming" }, { "address": 16324, "type": "line", "text": "per frame of the basher's swing: the X offset of the cells it removes, facing right" }, { "address": 16333, "type": "line", "text": "the same facing left" }, { "address": 16342, "type": "line", "text": "the Y offset of those cells" }, { "address": 16352, "type": "line", "text": "the climber's Y offsets by frame" }, { "address": 16360, "type": "line", "text": "AND masks that clear one multicolour pixel of a byte: $3F, $CF, $F3, $FC" }, { "address": 16364, "type": "line", "text": "for each number of rows a lemming covers, the last character byte to clear" }, { "address": 16370, "type": "line", "text": "the floater's frames, by its counter" }, { "address": 18432, "type": "line", "text": "for each line of the terrain, the low byte of its offset within a sprite shape (three bytes a line, 21 lines a sprite); read by terrain_at" }, { "address": 18448, "type": "line", "text": "entry 0 of line_offset_unpack's table and a variable of the level's unpacker: $E0F5 sets it to 0 for the rearranging loop and $E136 puts back the 3 the table holds" }, { "address": 18452, "type": "line", "text": "line_offset_lo's entries 4 to $4F, $4814-$484F, which the level's unpacker also reads through $4810" }, { "address": 18512, "type": "line", "text": "line_offset_lo from line $50 on, $4850-$48B7" }, { "address": 18628, "type": "line", "text": "AND masks that keep one multicolour pixel: $C0, $30, $0C, $03, repeated" }, { "address": 18644, "type": "line", "text": "the low bytes of the countdown digits' shapes, drawn above a lemming whose fuse burns ($1CD2, by $4D9B)" }, { "address": 18664, "type": "line", "text": "the first sprite pointers of the eight terrain sprites" }, { "address": 18672, "type": "line", "text": "the cursor shape's offsets for its four pixel positions (with $48F8)" }, { "address": 18680, "type": "line", "text": "the cursor shape's offsets for its four positions, second half ($1991)" }, { "address": 18688, "type": "line", "text": "for each line of the terrain, the high byte of its offset within the sprite shapes ($4800)" }, { "address": 18704, "type": "line", "text": "the same offsets as the level's unpacker reads them ($E094), low byte; $4810 is a variable of the unpacker" }, { "address": 18884, "type": "line", "text": "the low bytes of the 25 screen rows' starts (row times 40)" }, { "address": 18890, "type": "line", "text": "the same table from row 6, read by the water drawing" }, { "address": 18909, "type": "line", "text": "the high bytes of the rows' starts for the screen at $4000" }, { "address": 18915, "type": "line", "text": "the same from row 6" }, { "address": 18934, "type": "line", "text": "the cursor shape's offsets' high bytes" }, { "address": 18944, "type": "line", "text": "for each X offset from a lemming, the index of the terrain byte-column (four pixels to a byte)" }, { "address": 19264, "type": "line", "text": "the high bytes of the terrain columns' addresses (with $0801)" }, { "address": 19384, "type": "line", "text": "the low bytes of the screen rows in the lemmings' window, by character row" }, { "address": 19409, "type": "line", "text": "the lemmings' window's character rows, high bytes of their screen addresses" }, { "address": 19434, "type": "line", "text": "the cursor shapes' high bytes" }, { "address": 19442, "type": "line", "text": "the dig cells' Y offsets ($249D)" }, { "address": 19456, "type": "line", "text": "the low byte of each terrain byte-column's offset in the sprite shapes ($28F2)" }, { "address": 19776, "type": "line", "text": "the ninth bit of each terrain sprite's X position, by its place" }, { "address": 19784, "type": "line", "text": "the Y position of each of the eight terrain sprites' first row" }, { "address": 19792, "type": "line", "text": "the panel's 16 fixed characters, copied to $5000 and $5800" }, { "address": 19808, "type": "line", "text": "the low bytes of the countdown digits' second halves ($1CE9)" }, { "address": 19828, "type": "line", "text": "their high bytes ($1CF2)" }, { "address": 19848, "type": "line", "text": "the high bytes of the countdown digits' shapes ($1CDD)" }, { "address": 19867, "type": "line", "text": "for each value of the fuse's top bits ($041E, from $04EC), the countdown digit's entry in the tables above" }, { "address": 19898, "type": "line", "text": "the movement step the basher's handler returns in Y for each frame of its swing ($2683)" }, { "address": 19915, "type": "line", "text": "per frame of the miner's stroke, the value its handler returns in A, facing left ($27A7)" }, { "address": 19939, "type": "line", "text": "the same facing right ($279F)" }, { "address": 19962, "type": "line", "text": "how near the cursor a lemming must be, by row of the hit box: 2, 1, 0, 1, 2, then $80 for out of reach" }, { "address": 19968, "type": "line", "text": "the high byte of each terrain byte-column's offset in the sprite shapes ($28FC)" }, { "address": 20288, "type": "line", "text": "the rotation of the eight terrain sprites by the scroll column ($0CF0)" }, { "address": 20408, "type": "line", "text": "the release rate's units digit for each step 0-23 (with rate_tens: 01, 06, 12, 17 ... 99)" }, { "address": 20432, "type": "line", "text": "the release rate's tens digit for each step 0-23" }, { "address": 20456, "type": "line", "text": "the release timer's step for each rate step ($1E05)" }, { "address": 20480, "type": "line", "text": "the briefing code's entry points: $526E (load the level and show its briefing), $51F2 (the end-of-level screen), $5236 (a load failed), $5233 (insert another disk)" }, { "address": 20483, "type": "line", "text": "jump to result_screen" }, { "address": 20486, "type": "line", "text": "jump to the failed-load handler at $5236" }, { "address": 20489, "type": "line", "text": "jump to disk_prompt" }, { "address": 20492, "type": "line", "text": "runs the level's own unpacker at $E094 with the RAM under the ROMs in view ($01 = $35)" }, { "address": 20506, "type": "line", "text": "for the level preview: counts how often each of the four pixel colours occurs in one 4-pixel byte of the terrain ($5BC9-$5BCC)" }, { "address": 20544, "type": "line", "text": "the operand of the LDA at $503F, rewritten as the game runs, by $503A, $5047, $504A" }, { "address": 20561, "type": "line", "text": "draws one pixel of the small level preview on the briefing: the commonest colour of a block of the terrain ($501A four times), set into the preview's bitmap through $50FA/$510E and the masks at $50DA/$50EA" }, { "address": 20682, "type": "line", "text": "the operand of the ADC at $50C9, rewritten as the game runs, by $50AE" }, { "address": 20698, "type": "line", "text": "the preview's AND masks per pixel position" }, { "address": 20714, "type": "line", "text": "the preview's pixel values per colour and position" }, { "address": 20730, "type": "line", "text": "the preview bitmap's column addresses, low bytes" }, { "address": 20750, "type": "line", "text": "the same, high bytes" }, { "address": 20770, "type": "line", "text": "clears the screen to black, copies the level header to $6F00 (with the RAM under the ROMs in view), blanks the leading zeros of its numbers, sets up the screen's colour bars ($6D00-$6D54, $6C00-$6CA8), the raster interrupt at $52AA on line $2D, and the character screen at $4000 with its characters at $6000" }, { "address": 20978, "type": "line", "text": "the end-of-level screen: the level's figures ($532D) and the messages; when all 100 are done ($5BD0) the congratulations and returns $40; otherwise waits for fire (returns $80, the next level) or RUN/STOP (returns 0, the menu)" }, { "address": 21043, "type": "line", "text": "asks for the disk side the loader wants: \"Please insert disk N side X\", the number and letter worked out from the side in A, then waits for fire" }, { "address": 21046, "type": "line", "text": "an entry inside the BIT at $5235: entered here, its operand runs as LDX #$80; reached by $5006 JMP, while the way through the BIT skips it" }, { "address": 21061, "type": "line", "text": "the operand of the LDA at $5244, rewritten as the game runs, by $5238" }, { "address": 21081, "type": "line", "text": "the operand of the LDA at $5258, rewritten as the game runs, by $523B" }, { "address": 21102, "type": "line", "text": "loads the level's files ($5BAF), unpacks the terrain ($500C), checks that the level's own code at $E005 matches the code kept at $CB49 (a mismatch turns the border red and stops the machine at $5286), then draws the briefing: the preview ($5454), its frame ($54F9), the texts ($530B), and waits for fire" }, { "address": 21147, "type": "line", "text": "turns the screen on and waits for fire on port 2" }, { "address": 21162, "type": "line", "text": "the briefing screen's raster interrupt: from line $32 to $FA changes the background colour each line from the table at $6DCE (the colour bars behind the text)" }, { "address": 21201, "type": "line", "text": "copies the eight fields of the level header into the screens' texts, by the tables at $540C-$542C: name, number, lemmings, percentages, release rate, next number and next code (letters, $40 added)" }, { "address": 21240, "type": "line", "text": "the operand of the ADC at $52F7, rewritten as the game runs, by $52E5" }, { "address": 21242, "type": "line", "text": "the low byte of the STA at $52F9, rewritten as the game runs, by $52D9" }, { "address": 21243, "type": "line", "text": "the high byte of the STA at $52F9, rewritten as the game runs, by $52DF" }, { "address": 21247, "type": "line", "text": "the operand of the CPY at $52FE, rewritten as the game runs, by $52EE" }, { "address": 21259, "type": "line", "text": "the briefing's fields ($52D1), the rating's name from $5434 and the minutes" }, { "address": 21293, "type": "line", "text": "the end screen's figures: the percentage saved ($CB40-$CB42), the message chosen by $53CF, and, for a level passed, the next level's code: the level number $CB48 goes up by one and the next code is kept at $CB49; after the hundredth level it goes back to 0 and $5BD0 says the game is complete" }, { "address": 21354, "type": "line", "text": "an entry inside the BIT at $5369: entered here, its operand runs as LDX #$05; reached by $5365 BPL, while the way through the BIT skips it" }, { "address": 21402, "type": "line", "text": "an entry inside the BIT at $5399: entered here, its operand runs as LDA #$00; reached by $537B BPL, $5390 BNE, while the way through the BIT skips it" }, { "address": 21414, "type": "line", "text": "the sound for each kind of result message" }, { "address": 21420, "type": "line", "text": "the KERNAL's interrupt back ($EA31) and its video chip registers ($ECCB), for the loader" }, { "address": 21455, "type": "line", "text": "which message the end screen shows, by the lemmings saved ($CB45) against the level's number ($6F39) and the number to save ($6F40): all of them, none, enough or not; some messages are picked at random by the raster line's lowest bit. X = $80 when the level was passed" }, { "address": 21516, "type": "line", "text": "the eight fields' destinations in the briefing and end texts, low bytes" }, { "address": 21524, "type": "line", "text": "the eight fields' destinations, high bytes" }, { "address": 21532, "type": "line", "text": "what each field's characters have added: $40 for the access code's letters" }, { "address": 21540, "type": "line", "text": "where each field starts in the header copy at $6F00" }, { "address": 21548, "type": "line", "text": "each field's length" }, { "address": 21556, "type": "line", "text": "the four ratings' names, eight screen codes each: Fun, Tricky, Taxing, Mayhem" }, { "address": 21588, "type": "line", "text": "the briefing's small picture of the whole level: one pixel for each block of the terrain, 77 columns by 40 rows ($5051)" }, { "address": 21619, "type": "line", "text": "waits for a press of fire (from the start of a frame), then turns the screen off, gives the interrupt back to the KERNAL ($53AC) and clears the screen at $4000" }, { "address": 21676, "type": "line", "text": "the briefing's colours from the header copy ($6F60-$6F68), clears the screen ($4000-$43FF) to character $46 and colour RAM to 0, the preview's bitmap to $FF and the colour bar table at $6E00" }, { "address": 21753, "type": "line", "text": "puts the preview's characters on the screen: 20 rows of five characters from $9C onwards" }, { "address": 21766, "type": "line", "text": "the operand of the LDA at $5505, rewritten as the game runs, by $54FB, $550D" }, { "address": 21787, "type": "line", "text": "the numbers of the lines that make up the end-of-game screen, 0 to end" }, { "address": 21795, "type": "line", "text": "the end screen's variables: the line it prints ($5523) and its row ($5526, $5527)" }, { "address": 21798, "type": "line", "text": "the row the end screen's message starts on ($5358)" }, { "address": 21799, "type": "line", "text": "the row after it ($535E)" }, { "address": 21800, "type": "line", "text": "the message lines chosen for this result" }, { "address": 21811, "type": "line", "text": "prints the end-of-game messages: the lines numbered in $551B" }, { "address": 21814, "type": "line", "text": "an entry inside the BIT at $5535: entered here, its operand runs as LDY #$08; reached by $5209 JSR, while the way through the BIT skips it" }, { "address": 21817, "type": "line", "text": "an entry inside the BIT at $5538: entered here, its operand runs as LDY #$00; reached by $5298 JSR, while the way through the BIT skips it" }, { "address": 21840, "type": "line", "text": "prints line X of the end screen's texts: its row and column from the table at $5608/$562E, its colour bar from $5B3F, then its characters through $55A9 (each letter drawn as two characters, the lower one $4B further on)" }, { "address": 21875, "type": "line", "text": "the operand of the LDX at $5572, rewritten as the game runs, by $5565" }, { "address": 21929, "type": "line", "text": "maps a text character to the briefing font's character" }, { "address": 22024, "type": "line", "text": "the low bytes of the screen texts' addresses, by line number" }, { "address": 22062, "type": "line", "text": "the high bytes of the same; the texts follow from $5655" }, { "address": 22219, "type": "line", "text": "the briefing's and the end screens' texts, each line led by its column and row, the fields filled in from the level header ($52D1): \"Rating\", \"Number of Lemmings\", \"Your time is up!\", the result messages, the access code, \"Please insert disk\", \"CONGRATULATIONS !!!\" and the end-of-game lines" }, { "address": 22240, "type": "line", "text": "the briefing's rating field, eight characters copied from $5434 ($531A)" }, { "address": 22363, "type": "line", "text": "the first of the end screen's percentage digits" }, { "address": 22364, "type": "line", "text": "the end screen's percentage digits ($5338-$534D), the first two blanked when zero" }, { "address": 22432, "type": "line", "text": "more of the screen texts (from \"...do it again\")" }, { "address": 22440, "type": "line", "text": "screen texts, $57A8-$57AF; in play the character set at $5000 has character $F5 here, a frame of the water drawn by $2CAD" }, { "address": 22448, "type": "line", "text": "screen texts, $57B0-$57B7; in play character $F6, written by $2CB9" }, { "address": 22456, "type": "line", "text": "screen texts, $57B8-$57BF; in play character $F7, written by $2CBF" }, { "address": 22464, "type": "line", "text": "screen texts, $57C0-$57C7; in play character $F8, written by $2CC8" }, { "address": 22472, "type": "line", "text": "screen texts, $57C8-$57CF; in play character $F9, written by $2CD4" }, { "address": 22480, "type": "line", "text": "screen texts, $57D0-$57D7; in play character $FA, written by $2CE0" }, { "address": 22488, "type": "line", "text": "screen texts, $57D8-$57DF; in play character $FB, written by $2CE6" }, { "address": 22496, "type": "line", "text": "screen texts, $57E0-$57E7; in play character $FC, the cursor's top left, built by draw_cursor" }, { "address": 22504, "type": "line", "text": "screen texts, $57E8-$57EF; in play character $FD, the cursor's top right" }, { "address": 22512, "type": "line", "text": "screen texts, $57F0-$57F7; in play character $FE, the cursor's bottom left" }, { "address": 22520, "type": "line", "text": "screen texts, $57F8-$57FF; in play character $FF, the cursor's bottom right" }, { "address": 22528, "type": "line", "text": "more of the screen texts" }, { "address": 22997, "type": "line", "text": "the end screen's access code field: ten letters ($52F9)" }, { "address": 23046, "type": "line", "text": "\"insert disk N side X\": the disk number written here by $5255 and the side letter at $5A0D by $524B" }, { "address": 23053, "type": "line", "text": "the side letter of \"insert disk N side X\" ($524B)" }, { "address": 23286, "type": "line", "text": "for screen row X, the pointers to the row on the screen at $4000 and in colour RAM ($20-$27), from $5B1D/$5B36" }, { "address": 23325, "type": "line", "text": "the low bytes of the briefing screen's rows" }, { "address": 23326, "type": "line", "text": "brief_row_lo from its second entry, the next row's start ($5B09)" }, { "address": 23350, "type": "line", "text": "the high bytes" }, { "address": 23351, "type": "line", "text": "brief_row_hi from its second entry ($5B10)" }, { "address": 23359, "type": "line", "text": "the base of the colour bars read at $5579, indexed from each text line's third byte up to the next multiple of 16; $5B3F-$5B4E are also brief_row_hi's last sixteen entries" }, { "address": 23471, "type": "line", "text": "loads the files of level $CB48 when they are not in memory already ($CB53): its level file by the code at $0400+n, then its tune by the code at $0700+n" }, { "address": 23495, "type": "line", "text": "the preview's working bytes: the block's column ($5BC7) and row ($5BC8), the four colour counts ($5BC9-$5BCC), the preview's column and row ($5BCD, $5BCE); then the field index ($5BCF), the game-complete flag ($5BD0), the level-passed flag ($5BD1) and the end screen's line ($5BD3-$5BD6)" }, { "address": 23496, "type": "line", "text": "the preview block's row within the terrain" }, { "address": 23497, "type": "line", "text": "how many pixels of colour 0 the block has" }, { "address": 23498, "type": "line", "text": "of colour 1" }, { "address": 23499, "type": "line", "text": "of colour 2" }, { "address": 23500, "type": "line", "text": "of colour 3" }, { "address": 23501, "type": "line", "text": "the preview's column, two at a time" }, { "address": 23502, "type": "line", "text": "the preview's row" }, { "address": 23503, "type": "line", "text": "the field fill_texts is copying" }, { "address": 23504, "type": "line", "text": "bit 7 set once level 100 has been passed" }, { "address": 23505, "type": "line", "text": "bit 7 set when the level was passed: fire then moves on" }, { "address": 23507, "type": "line", "text": "the line print_line is printing" }, { "address": 23508, "type": "line", "text": "the position in the line's text" }, { "address": 23509, "type": "line", "text": "the screen column the next character goes to" }, { "address": 23510, "type": "line", "text": "the index into end_lines" }, { "address": 24576, "type": "line", "text": "the briefing and end screens' character set, at $6000 for the screen at $4000; in play this memory holds the shown copy of the terrain sprites instead" }, { "address": 24640, "type": "line", "text": "the briefing font, its second 64 bytes; in play the same addresses hold the shown terrain that copy_column moves ($0D71)" }, { "address": 24704, "type": "line", "text": "the briefing font from $6080; copy_column's third pair of addresses in play" }, { "address": 24745, "type": "line", "text": "named only as the operand of the BIT at $2984 (the skip idiom); the bytes are the briefing font's" }, { "address": 24768, "type": "line", "text": "the briefing font from $60C0; copy_column's fourth pair in play" }, { "address": 24832, "type": "line", "text": "the briefing font from $6100; copy_column's fifth pair" }, { "address": 24896, "type": "line", "text": "the briefing font from $6140; copy_column's sixth pair" }, { "address": 24960, "type": "line", "text": "the briefing font from $6180; copy_column's seventh pair" }, { "address": 25024, "type": "line", "text": "the briefing font from $61C0; copy_column's eighth pair" }, { "address": 26624, "type": "line", "text": "a second copy of the first 1 KB of the briefing font" }, { "address": 28672, "type": "line", "text": "the panel's character set, $7000-$77FF, which line 217 selects ($D018 = $0C, band_panel): the characters the panel shows lie in $7000-$739F (codes up to $73 in play), with the panel's rows of text at $7170 among them; sprite shapes $CF-$D2 at $73C0-$74BF are the panel's four sprites ($3F90), and tables follow from $74C0. Seen as sprite shapes, $7000-$73BF is $C0-$CE, which no sprite shows" }, { "address": 28800, "type": "line", "text": "the address the operand at $2A5D holds in this snapshot, from before the level set-up: $1000 rewrites it with the level's object table ($E080); the bytes here are the panel character set's" }, { "address": 28928, "type": "line", "text": "the operand at $2AC0 before $1000 rewrites it with the objects' columns ($E082); the bytes are the panel character set's" }, { "address": 29040, "type": "line", "text": "the panel's three rows of characters, $7170-$71E7, copied to screen rows 22-24 at $4370 by $11B4, which also sets their colour RAM to 9" }, { "address": 29056, "type": "line", "text": "the operand at $2AE6 before $1000 rewrites it ($E084); the bytes are the panel character set's" }, { "address": 29184, "type": "line", "text": "the operand at $2AEF before $1000 rewrites it ($E086); the bytes are the panel character set's" }, { "address": 29312, "type": "line", "text": "the operand at $2ADA before $1000 rewrites it ($E088); the bytes are the panel character set's" }, { "address": 29440, "type": "line", "text": "the operand at $2AE0 before $1000 rewrites it ($E08A); the bytes are the panel character set's" }, { "address": 29568, "type": "line", "text": "the operand at $2AD4 before $1000 rewrites it ($E08C); the bytes are the panel character set's" }, { "address": 29632, "type": "line", "text": "the panel's four sprite shapes, $CF-$D2 ($73C0-$74BF), one of them the highlight on the chosen skill ($3F90)" }, { "address": 29888, "type": "line", "text": "for each character code 0-255, the low byte of its 8 bytes in the character set at $5000 (code times 8)" }, { "address": 30144, "type": "line", "text": "for each character code 0-255, the high byte of its bitmap's address in the character set at $5000 ($50-$57)" }, { "address": 30400, "type": "line", "text": "the high bytes for the character set at $5800, used for the other screen" }, { "address": 30656, "type": "line", "text": "the X position of the panel's highlight for each skill" }, { "address": 30664, "type": "line", "text": "its ninth bit" }, { "address": 30672, "type": "line", "text": "the keyboard rows of the 13 keys read_keys scans" }, { "address": 30685, "type": "line", "text": "their columns" }, { "address": 30698, "type": "line", "text": "the panel cells of the ten counts (release rate and skills)" }, { "address": 30708, "type": "line", "text": "the panel cells of the clock and the counts' digits" }, { "address": 30720, "type": "line", "text": "pixel shapes, small figures on a blank ground; no instruction names this block, and what reads it is open" }, { "address": 31504, "type": "line", "text": "the bomber's blast picture: one byte column a row ($7B10, $7B30)" }, { "address": 31536, "type": "line", "text": "the blast picture's second column of bytes ($2333)" }, { "address": 32024, "type": "line", "text": "the terrain sprites' Y offset for each fine scroll position" }, { "address": 32144, "type": "line", "text": "the panel's 13 fixed cells: character and position, two bytes each" }, { "address": 32145, "type": "line", "text": "the second byte of each pair in panel_fixed: the cell's position ($15D9)" }, { "address": 32170, "type": "line", "text": "the miner's cells' X offsets" }, { "address": 32197, "type": "line", "text": "their Y offsets" }, { "address": 32225, "type": "line", "text": "the movement step the miner's handler returns in Y for each frame ($27AA)" }, { "address": 32238, "type": "line", "text": "the first cell of each mine stroke" }, { "address": 32240, "type": "line", "text": "the last cell" }, { "address": 32253, "type": "line", "text": "the climbing actions by direction ($10, $91)" }, { "address": 32255, "type": "line", "text": "the address the rearranging loop's LDA operand holds before $E0E9 sets it to $B12F; the byte is climb_actions'" }, { "address": 32768, "type": "line", "text": "the level's terrain as multicolour sprite shapes, built by the level's unpacker ($E094): 78 byte-columns of four pixels by 168 lines, arranged as the play area's sprites read them; $8000-$83FF holds the first shapes" }, { "address": 32930, "type": "line", "text": "named only as the operand of the BIT at $5235 (the skip idiom); the bytes are terrain_0's" }, { "address": 32994, "type": "line", "text": "the level's terrain shapes, continued: $80E2-$83BE" }, { "address": 33727, "type": "line", "text": "the level's terrain shapes, $83BF-$83FF" }, { "address": 33792, "type": "line", "text": "the level's terrain shapes, $8400-$87FF" }, { "address": 34816, "type": "line", "text": "the level's terrain shapes, $8800-$8BFF" }, { "address": 35241, "type": "line", "text": "named only as the operand of the BITs at $2547 and $25E3 (the skip idiom); the bytes are terrain_2's" }, { "address": 35327, "type": "line", "text": "the level's terrain shapes, $89FF-$8BFF" }, { "address": 35840, "type": "line", "text": "the level's terrain shapes, $8C00-$8FFF" }, { "address": 36864, "type": "line", "text": "the level's terrain shapes, $9000-$93FF; between levels the briefing's stash is unpacked through here ($CBD2), so $9000-$9007 are also its header" }, { "address": 36865, "type": "line", "text": "the boot unpack's header, byte 1 (the source's low byte)" }, { "address": 36866, "type": "line", "text": "byte 2 (the output's high byte)" }, { "address": 36867, "type": "line", "text": "byte 3 (the output's low byte)" }, { "address": 36868, "type": "line", "text": "byte 4 (the end's high byte)" }, { "address": 36869, "type": "line", "text": "byte 5 (the end's low byte)" }, { "address": 36870, "type": "line", "text": "byte 6 (the literal count's high byte)" }, { "address": 36871, "type": "line", "text": "the last byte of the stash's header when it is at $9000 ($CC62); in this snapshot it is terrain" }, { "address": 36935, "type": "line", "text": "the level's terrain shapes, $9047-$9148" }, { "address": 37200, "type": "line", "text": "the menu's entry, where to_menu ($CD53) jumps once the menu's files are in; in this part's memory the bytes are terrain" }, { "address": 37263, "type": "line", "text": "the level's terrain shapes, $918F-$9277" }, { "address": 37567, "type": "line", "text": "the level's terrain shapes, $92BF-$934E" }, { "address": 37778, "type": "line", "text": "the level's terrain shapes, $9392-$93FF" }, { "address": 37888, "type": "line", "text": "the level's terrain shapes, $9400-$97FF" }, { "address": 38912, "type": "line", "text": "the level's terrain shapes, $9800-$9BFF" }, { "address": 39936, "type": "line", "text": "the level's terrain shapes, $9C00-$9FFF" }, { "address": 40704, "type": "line", "text": "the address the STA at $CBF8 holds in this snapshot; $CBEB rewrites its high byte to $90 before the copy runs, so nothing is written here. The bytes are terrain" }, { "address": 40841, "type": "line", "text": "the level's terrain shapes, $9F89-$9FE3 (the copy of the level file goes here after a level)" }, { "address": 40960, "type": "line", "text": "the level's terrain shapes, $A000-$A3FF" }, { "address": 41984, "type": "line", "text": "the level's terrain shapes, $A400-$A7FF" }, { "address": 43008, "type": "line", "text": "the level's terrain shapes, $A800-$ABFF" }, { "address": 44032, "type": "line", "text": "the level's terrain shapes, $AC00-$AFFF" }, { "address": 45056, "type": "line", "text": "the level's terrain shapes, $B000-$B3FF, the last" }, { "address": 46080, "type": "line", "text": "the numbers 0-255: lets the drawing read a byte through an index ($1D4B)" }, { "address": 46336, "type": "line", "text": "256 zero bytes, read by the drawing routines through an index where nothing is to be added" }, { "address": 46592, "type": "line", "text": "n / 4 for n = 0-255; this table and the five after it ($B700-$BBEF) are named by no instruction, and what reads them is open" }, { "address": 46848, "type": "line", "text": "(n mod 4) times $40; named by no instruction" }, { "address": 47104, "type": "line", "text": "n / 16; named by no instruction" }, { "address": 47360, "type": "line", "text": "(n mod 16) times 16; named by no instruction" }, { "address": 47616, "type": "line", "text": "another table of 256 with four values; what reads it is open" }, { "address": 47872, "type": "line", "text": "(n times 4) mod 256; named by no instruction" }, { "address": 48112, "type": "line", "text": "the lemmings' animation frames: rows of multicolour pixels, 16 bytes a frame, pointed to by $3C00/$3D2C" }, { "address": 49136, "type": "line", "text": "the lemmings' animation frames, $BFF0-$C3EF" }, { "address": 49152, "type": "line", "text": "the lemmings' animation frames, $C000-$C004, between two labels" }, { "address": 49157, "type": "line", "text": "the lemmings' animation frames, $C005-$C3EF (past a label at $C004)" }, { "address": 50160, "type": "line", "text": "the lemmings' animation frames, $C3F0-$C7EF" }, { "address": 50176, "type": "line", "text": "the end sequence's entry, where to_ending ($CD5B) jumps once IC is in; in this part's memory the bytes are animation frames" }, { "address": 50186, "type": "line", "text": "the lemmings' animation frames, $C40A-$C7EF, after the end sequence's entry label at $C400" }, { "address": 51184, "type": "line", "text": "the lemmings' animation frames, $C7F0-$CB0F, the last" }, { "address": 57344, "type": "line", "text": "the level's header, unpacked from its file to $E000 (level 1, Fun, in this snapshot): $E000 its number as text, $E002 the next level's number as text, $E004 the rating (0 Fun, 1 Tricky, 2 Taxing, 3 Mayhem), $E005 this level's access code and $E00F the next level's (ten letters each, A = 1), $E019 the name (30 screen codes), $E037 the number of lemmings as text and $E039 as a number, $E03A the release rate as text and $E03C as a step (0-23), $E03D the percentage to save as text and $E040 the number to save, $E041 the minutes, $E044 the eight skills' tens and $E04C their units" }, { "address": 57401, "type": "line", "text": "the number of lemmings in the level (10 here), as a number" }, { "address": 57404, "type": "line", "text": "the release rate's starting and lowest step (11 here, shown as 50)" }, { "address": 57409, "type": "line", "text": "the time allowed, in minutes (5 here); with the next two bytes the clock's start, copied to $CB39-$CB3B" }, { "address": 57412, "type": "line", "text": "the eight skills' counts, tens digits (climber to digger)" }, { "address": 57420, "type": "line", "text": "the eight skills' counts, units digits (the digger's 10 here)" }, { "address": 57428, "type": "line", "text": "non-zero when the lemmings come out facing alternate ways; $E055 is the next one's direction" }, { "address": 57429, "type": "line", "text": "the direction the next lemming comes out facing, $80 for the other way" }, { "address": 57430, "type": "line", "text": "the percentage one lemming is worth, four decimal digits (10.00 for a level of 10), added up by $2A1A" }, { "address": 57436, "type": "line", "text": "four steps of the level's colours for the fades: background ($E05C), multicolour 0 ($E060), sprite colour ($E064), multicolour 1 ($E068)" }, { "address": 57440, "type": "line", "text": "the four fade steps of multicolour 0" }, { "address": 57444, "type": "line", "text": "the four fade steps of the terrain sprites' colour" }, { "address": 57448, "type": "line", "text": "the four fade steps of multicolour 1" }, { "address": 57452, "type": "line", "text": "the trap doors: column (two bytes) and row, three bytes each, $FF after the last" }, { "address": 57453, "type": "line", "text": "the entrances' columns, low bytes (every third byte from here)" }, { "address": 57454, "type": "line", "text": "the entrances' rows (every third byte), and $FF after the last" }, { "address": 57461, "type": "line", "text": "the level's exits, three bytes each (the column's high byte, its low byte, then the row), two at most: $1351 sets the exit test ($1F82, $1F8E, $1F96) from one of them each pass, alternating ($06E2); $E07A is $FF when there is only one" }, { "address": 57462, "type": "line", "text": "the exits' columns, low bytes" }, { "address": 57463, "type": "line", "text": "the exits' rows" }, { "address": 57466, "type": "line", "text": "the second exit's first byte: $FF when the level has one exit" }, { "address": 57467, "type": "line", "text": "how many animated objects the level has ($2A48); also the length of the block at ($E080) that $1000 rewrites" }, { "address": 57468, "type": "line", "text": "non-zero when the level has a map of special cells (steel, one-way walls); bit 7 set when it has no one-way walls" }, { "address": 57469, "type": "line", "text": "bit 7 set when the level has water or lava ($2B96)" }, { "address": 57470, "type": "line", "text": "the kind of water, times 8 ($10C, $2BF6)" }, { "address": 57471, "type": "line", "text": "bit 7 set makes the clock slower: $0EE9 adds 4 a pass instead of 5 towards a second ($108F)" }, { "address": 57472, "type": "line", "text": "ten pointers into the level's own data that $1000 copies into the routines' operands: the objects, their graphics and the cell map" }, { "address": 57474, "type": "line", "text": "the pointer to the objects' columns, copied to $2AC0" }, { "address": 57476, "type": "line", "text": "the pointer copied to $2AE6" }, { "address": 57478, "type": "line", "text": "the pointer copied to $2AEF" }, { "address": 57480, "type": "line", "text": "the pointer copied to $2ADA" }, { "address": 57482, "type": "line", "text": "the pointer copied to $2AE0" }, { "address": 57484, "type": "line", "text": "the pointer copied to $2AD4" }, { "address": 57486, "type": "line", "text": "the cell map's address, low byte ($2DB5)" }, { "address": 57487, "type": "line", "text": "the cell map's address, high byte" }, { "address": 57488, "type": "line", "text": "a pointer copied to $2D8F and $2CF1: the water map" }, { "address": 57490, "type": "line", "text": "a pointer copied to $2D94, $2CFF and $2D2B" }, { "address": 57492, "type": "line", "text": "the level's own routine, in its file: unpacks the level's terrain with the loader's scheme (bytes below $E0 are copied, codes from $E0 up repeat a byte or fill to an address) from its header at $E1A0 to $7E00-$B12F; then rearranges those 13,104 bytes, 78 columns by 168 lines, into the layout of sprite shapes at $8000-$B3FF that the play area shows, by the column and line tables at $0801/$4B40 and $4810/$4910" }, { "address": 57622, "type": "line", "text": "the low byte of the LDA at $E115: where the rearranging loop reads the unpacked terrain, from $B12F downwards" }, { "address": 57623, "type": "line", "text": "the high byte of the LDA at $E115, the read pointer into the unpacked terrain" }, { "address": 57625, "type": "line", "text": "the low byte of the STA at $E118: where the byte goes in the sprite shapes, from the column and line tables" }, { "address": 57626, "type": "line", "text": "the high byte of the STA at $E118, the target in the sprite shapes" }, { "address": 57639, "type": "line", "text": "the operand of the LDY at $E126: the line counter, $A7 down to 0" }, { "address": 57646, "type": "line", "text": "the operand of the LDX at $E12D: the column counter, $4D down to 0" }, { "address": 57658, "type": "line", "text": "the level unpacker's own copy of the loader's next_byte: the next byte of the terrain's packed stream" }, { "address": 57751, "type": "line", "text": "stores A at the unpack's output and moves it on" }, { "address": 57760, "type": "line", "text": "the packed terrain's header: the stream's start, its output ($7E00), its end and the count of literal bytes of $E0 and up before the first code" }, { "address": 57761, "type": "line", "text": "the packed terrain's start, low byte" }, { "address": 57762, "type": "line", "text": "the unpack's output, high byte ($7E)" }, { "address": 57763, "type": "line", "text": "the unpack's output, low byte" }, { "address": 57764, "type": "line", "text": "the packed stream's end, high byte" }, { "address": 57765, "type": "line", "text": "the packed stream's end, low byte" }, { "address": 57766, "type": "line", "text": "the count of literal bytes from $E0 up, high byte" }, { "address": 57767, "type": "line", "text": "the same, low byte" }, { "address": 57768, "type": "line", "text": "the level's terrain, packed: the stream the level's unpacker reads ($E094); spent once it has run" }, { "address": 58651, "type": "line", "text": "named by the JSR at $08AA, a call to the KERNAL's screen editor set-up with the ROM in view; the RAM here holds the packed terrain" }, { "address": 58673, "type": "line", "text": "the packed terrain stream, $E531-$E5A7" }, { "address": 58792, "type": "line", "text": "the packed terrain stream, $E5A8-$E9A7" }, { "address": 59816, "type": "line", "text": "the packed terrain stream, $E9A8-$EDA7" }, { "address": 60601, "type": "line", "text": "named by $08AF, which copies the KERNAL ROM's video chip defaults with the ROM in view; the RAM here holds the packed terrain" }, { "address": 60619, "type": "line", "text": "named by $53BD, which copies the KERNAL ROM's video chip defaults; the RAM here holds the packed terrain" }, { "address": 60683, "type": "line", "text": "the packed terrain stream, $ED0B-$EDA7" }, { "address": 60840, "type": "line", "text": "the packed terrain stream, $EDA8-$F1A7" }, { "address": 61864, "type": "line", "text": "the packed terrain stream, $F1A8-$F4FA, its end" }, { "address": 62715, "type": "line", "text": "the level's objects, seven tables of $52 entries at the addresses $E080-$E08C give ($F4FB, $F54D, $F59F, $F5F1, $F643, $F695, $F6E7): kind and flags, column, and the addresses of each object's characters and graphics, read by animate_objects ($2A48); then more of the level's data up to $F9FF" }, { "address": 63739, "type": "line", "text": "the level's object tables and data, $F8FB-$F9F4" }, { "address": 64000, "type": "line", "text": "the last byte of the level's object area before level 1's file's tail at $FA01" }, { "address": 64001, "type": "line", "text": "the last bytes of level 1's file, $FA01-$FA2C, after its object tables" }, { "address": 64816, "type": "line", "text": "named by $08B5, which copies the KERNAL ROM's vectors with the ROM in view; the RAM here is not that table" } ] }