A working disassembly and construction kit for the exact Magic Desk cartridge supplied for this project. Every semantic claim is tied to bytes, traces, or a confidence label.
Reset enters $804A, the conversion copies a loader to RAM, selects bank 7 at $DE00, and waits for joystick fire. A temporary monitor patch reaches the relocated game entry at $5EEC; the release CRT is never patched.
The private build preserves all CRT and CHIP headers, assembles the source-owned bootstrap envelope, and repacks all 20 8 KiB payloads. The verified baseline output has the same hash as the supplied image.
Paint the original screen tiles and colours. Export your changes as a rebuildable project.
Loading exact cartridge captures…
Loading verified maps and original character graphics…
Original character graphics, source map and C64 colours. Sprites and running effects are not simulated. The bottom two HUD rows are locked.
Landing-pad rules, passenger routes, taxi starts and hazard code stay original. Moving their artwork does not move their behaviour. Build and test your exported project in VICE.
Edit a verified title literal while preserving byte length. Unknown bytes remain untouched and every edit carries a precondition.
Original cartridge captures. Byte edits do not change these images. Export and rebuild the project, then open the modified CRT in VICE.
Title-byte editing preview · not a game screenshotThe reviewed source envelope is explicit byte-oriented assembly. A label is only shown where the evidence ledger supports it.
Address-oriented names below are confidence-qualified observations from canonical banks 0–7 after relocation. They are separate from the conversion-owned bootstrap.
Six per-module hook veneers are tracked separately from stable runtime code.
Runtime ownership is shown only where the current evidence supports it. Paged banks 8–19 are kept separate from the relocated RAM image.
$DE00Banks 18 and 19 are byte-identical at the payload level. This is an observed storage fact, not proof that either bank is unused at runtime.
Static observations, VICE traces, and conservative interpretations are kept distinct.
64-byte header, Magic Desk hardware type 19, 20 consecutive 8 KiB CHIP packets, load address $8000.
Bank 7 copies a 256-byte loader to $0800; the loader displays conversion/module content and waits for joystick fire.
The final stack handoff disables the cartridge and jumps through the relocated $8400 stub to $5EEC.
No editor control is exposed for physics, passengers, scoring, speech, high scores, or hazard behavior until mutation-tested.
known-unknowns.md