1983 · Epyx
Every byte of the C64's 64 KB, one pixel each, 512 to a row. Lit pixels are what this game is: its code, graphics, level data, sound, text, tables and variables, exactly where they sit in memory. Dim areas are screen and working memory; dark is unused.
This game is in 33 parts. The map is of Resident engine and startup, which stays in memory; the band marked as varying holds whichever of the 32 parts loaded over it is there. The Source tab has the listing of each part that has one.
| Tier | silver (claimed) |
|---|---|
| Coverage | 100 % of the bytes the game uses have a description |
| Comments checked | Not measured. No sample of the listing’s comments has been checked. How listings are checked |
| Build analysed | JUMPMAN REV 1.0, supplied GCR disk |
| Copy | human-edited |
| Tools | emulator: release v3.13.2, v3.13.2-linux-x86_64-gui.zip, disassembler: regenerator2000 0.9.20, host: Linux x86_64, Codex desktop session with no X display; GUI emulator under Xvfb |
| Model | gpt-6-astra |
| Kit version | 0.0.54 |
Every step that measured the Source tab’s comments or made them more accurate, in the order it happened, with the models that did it. Accuracy of the Source explains each step and what the row above makes of them.
| Step | By | What it found | Of the listing |
|---|---|---|---|
| Research | gpt-6-astra | Looked the game up online (its manual, reviews or wiki pages) before reading its code. | |
| Annotation | gpt-6-astra | Wrote the listing’s comments. 100 % of the program is described, in 2,502 comments. three agents |
likely wrong the sample’s range corrected right, or likely right not yet measured
The inventory began from the supplied game's screens and the C64 manual, before code analysis. Status is the evidence now available: live means VICE observation, traced means original instructions/data, CPU checked means controlled original-code execution, differs means the code contradicts the documentation, and open names a remaining verification limit. Controlled state tests do not prove player reachability. Addresses refer to the resident image unless a PLF file is named.
| Feature | Status | Evidence / limits |
|---|---|---|
| Animated EPYX and JUMPMAN title, attract demonstration | live + traced | Captured title; scripts $93EE/$94D4/$998C and actor VM $9A98 explain animation and synthetic controls. Natural $94BE/$9949 calls verify status-colour clearing before the credit/prompt;80 old status characters remain stored but hidden. |
| Five modes: Beginner, Intermediate, Advanced, Grand Loop, Randomizer | live + traced | Options screenshot; $7A1C, starts $7BF1/$7BF6, termination $5BB4/$5BB9. |
| Groups of 8, 10 and 12 numbered levels; 30 in Grand Loop | traced | Next-file markers 09,19,XX. Mystery Maze has three alternative files displaying25. All 32 files loaded and captured. |
| One to four players, alternating turns | traced | $7A9C rejects5; four 11-byte records $51C4, rotation $5106/$7400. Full four-player campaign not played. |
| Port2 joystick, directional jumping, ladders and ropes | live + traced | Controlled identical-snapshot input/no-input replays verify walking/up-fire/right-fire; $4320/$4900, level climb columns $3020. |
| Speeds1–8; new speed waits for next life | live | Key 1 changes $40E3 while live divider remains 4; native respawn after controlled death applies1 at $5799. |
| Seven starting lives | traced | Initial reserve counter 6 at $7BAF; current life is separate, $FF is eliminated. |
| Extra life each10,000 points | live | $5E06 tests at9999/10000; one award per invocation even for controlled30000. |
| Jump and fall hazards | live + original-code tests | Jump inputs verified live; 22-pair trajectory/contact port checked against original code. Unsupported grounded movement uses two updates, not a distance threshold. |
| Smart perimeter bullets | traced | $6800: cruise horizontal±2/vertical±1, align to player then attack±6/±3; initial header slot limits0/2/3/5. All-level survival behavior not replayed. |
| Collect all ordinary bombs; usually100 points | live + traced | Seven-byte records and $55BF; per-file points in $3015. Normal first-level joystick route earns100 and reduces targets12→11. Special records and callbacks change count/awards. |
| Bonus falls100 about every five seconds | live + traced | $4026 wraps every256 enabled game-service updates, about5.107s PAL. Live1500→1400,100→0 and zero-disable checks. |
| Completing a level adds remaining bonus to both totals | traced | $5B00; 24-bit score and cumulative-bonus fields $40DA–$40DF. |
| Geometry changes after bomb collection | original-code tests | Every decoded initial and post-bomb stream, including level30 stage2, matches all8192 output bytes of $4D0F. The interactive comparison also matches the original erase/redraw tail for397 initial-table records, alone and in forward/reverse sequences (1191 full bitmaps); private callback effects and legal pickup order are outside this view. |
| Fixed up/down rope routes | traced | Header arrays $3020–$302D, movement $4900; bitmap contact and column matching determine traversal. |
| Moving blocks, lifts, robots, bats and level-specific hazards | live + CPU checked + traced | All32 private programs traced;14 have expanded CPU checks. Ordinary inputs verify Robots I release, Jumping Blocks forced jump and Ride Around carry after native level selection. Full legal completion, platform transfers and natural mixed-mask effects remain open. |
| Robots III chooses and opens routes | CPU checked + interactive model | The page model matches 21,456 original routine calls across all 30 nodes, four opening states, full edge traversals and continuous three-robot sequences. Each bomb opens one downward direction; upward already exists. Natural collection and traversal of the opened paths remain unverified. |
| Shooting in Invasion, Dragon Slayer and Gunfighter | live + CPU checked | Ordinary inputs launch all three shots. Native Dragon Slayer replay completes with54 hits, all12 stairs, the goal bomb and2800 points without losing a life. Invasion scores75 and confirms a wrong-target collision. Gunfighter scores100 from a verified shot/enemy overlap and advances the pursuit-threshold selector; a no-fire control scores0. CPU cases verify directions, arc/cooldown/bounds and hit awards25/50/100. Gunfighter completion and a resulting change in enemy route choice remain open. |
| Freeze input lock | live + CPU checked | Native input/no-input replay verifies repeated80-count refresh and bullet death while frozen. CPU checks distinguish zero from release and confirm existing jump/fall can continue. |
| Followers replay player history | live + CPU checked | All256 creation cursors and1,100 updates verify seven independent creation-dependent lags; state2 clears followers/count/write cursor but retains history. Native joystick input creates two followers and reaches their death cleanup; a seven-follower route remains open. |
| Now You See It hides and restores scenery | live + CPU checked | Ordinary bomb and death verify matrix80 then85 with callback-isolated unchanged bitmap. CPU checks include05 alternation and restore-state transitions. |
| Grand Puzzle III stage-two death completes the level | live input + original-code tests | A joystick-only route collects nine bombs and touches the trigger alive after one lost life. Transformation preserves three targets. Subsequent LEFT collects a500-point bomb, then death reaches completion with two targets left, score1400 and four reserves. Controlled stage-one death respawns while lives remain. Earlier campaign entry remains unverified. |
| Puzzle bombs worth500 | traced | PLF07/15 special callbacks add 400 before ordinary 100; PLF30 second-stage special records use the same sum. |
| Three Mystery Maze variants selected by remaining lives | controlled live + original-code tests | PLF24 $3214 tests reserve counts below 3,3–4,at least 5 and selects2A/2B/2C. All256 bucket inputs checked; controlled Jungle completions with reserves2/4/5 load exact2A/2B/2C files. Full legal Jungle exit not replayed. |
| Mystery Maze hidden scenery reveals around player | original-code tests | Private init colors hide existing bitmap; callback changes nearby matrix cells. Collision reads unchanged bitmap. All393,216 coordinate cases across three layouts verify exact carry-dependent bounds and no display overrun. |
| Randomizer excludes level1 | differs, live | $5B8F rejects only00; controlled seeds0002/1F27 choose01. E9A7 chooses25, a missing file. Original title scan for25 cycles over128 pairs and never reaches LOAD; a natural route to that selection boundary remains open. |
| Final life awards100/250/500/750 | traced + live corner case | $29FF rates; controlled 88×750 displays66000 but stores/adds464. A legal88-life route is unverified. |
| Completed groups light buildings | traced | $2C00 flashes4/5/6/15 window pairs for modes1–4. |
| Separate total and bonus top20 score tables | live + traced | Records $20A6/$20BA, stride40; native insertion tests zero, positive, tie, greater. Ties rank below existing equal entries. |
| Three joystick-selected initials | live + original-code tests | Normal100-point qualification and joystick ABC entry passed; each letter resets the selector. Held fire may accept a blank when the25-tick cue ends; no release-edge check. |
| Completion mode letters / Randomizer R | traced | $26CD marks B/I/A/G/R/space; $6CB0 sets exhaustion marker. |
| Scores saved on writable disk | live + traced | $2F84 scratches SCORES then saves exactly$2000–$23FF. Native SAVE, clearing1024 RAM bytes, then LOAD restores the full image. Natural100-point/ABC entry returned to menu; hard reset and fresh game startup restored all1024 bytes exactly. No explicit save-error branch. |
| HOME/CLEAR at initial loading resets score records | traced | $2F08 accepts PETSCII13/93; replaces disk file with resident defaults. It does not zero the whole image. |
| Music and action effects | original-code + browser tests | 16 tune IDs,11 effect auditions;23764 frame/state and23413 ordered-write comparisons. PAL synthesis and SID bus decay are approximated as stated by the player. |
| All intended Hailstones bomb records terminate correctly | differs; bounded original-code tests | PLF13 lacksFF, but all262,144 normal-coordinate sampler cases yield valid keys or no pickup; all16 ordinary erasure subsets preserve that property. No natural failure is established. |
Read on 2 October 2026:
work/research/reference/ as external-c64sets-02.png and external-c64sets-03.png, from c64sets.com and c64sets.com. These private research copies are from that collection, not captures of this run, and are excluded from the published site.
reference/options.png and reference/level01.png are captures of this run.The contributor authorized online research and reference screenshots. No game image was downloaded.
Each part of the game has its own symbol map and listing, parts/<id>/symbols.json and parts/<id>/listing.json; the ids are the ones in its Source pages’ addresses. Write-ups, facts and symbol maps are CC BY-SA 4.0. The game itself is not hosted here.