tmerritt
9aef410424
Adds remaining NROM as _wip Update gitignore to not keep object files Adds AGENTS.md as this is an AI helped project
2.8 KiB
2.8 KiB
Urban Champion (JU) — Skeleton Project
ROM: _wip/Urban Champion (JU)/Urban Champion (JU).nes (24,592 bytes, iNES). Status: SKELETON — not yet disassembled. The entire 16 KB PRG bank is a single unclassified block; copilot/prg.s is the default-project skeleton (default_project.tar.gz) that reproduces it as one .incbin. The skeleton build is byte-identical at the PRG level.
ROM Facts
| Property | Value |
|---|---|
| Mapper | 0 (NROM) — from the iNES header |
| PRG | 16 KB (header claims map at CPU $C000–$FFFF) |
| CHR | 8 KB |
| Mirroring | Horizontal |
| Battery-backed flag | clear |
| ROM SHA-256 | 3ec5ac8db623dae34a0f4a4909f0af4569b2af0cee6c56bae512c87b7cff8749 |
| PRG SHA-256 | 13e7f2a77b01784a479895c0535357978af32f5139d971edf5f5b1936585357e |
Interrupt Vectors (taken from PRG $3FFA–$3FFF)
| Vector | Target | Note |
|---|---|---|
| NMI | $CA91 |
per-frame heartbeat |
| RESET | $CA00 |
non-$C000 entry at $CA00 — trace from here in Pass 1 |
| IRQ | $CA00 |
redirects to RESET — unused placeholder |
copilot/ Contents
| File | Purpose |
|---|---|
Urban Champion (JU).nes |
original ROM image (reference) |
prg.bin / header.bin / chr.bin |
split image, produced by _tools/splitnes.py |
prg.s |
Pass-1 skeleton: .incbin "prg.bin", $0000, $4000 (whole PRG) |
symbols.inc |
shared NES hardware constants (PPU/APU/controller, from the skeleton) |
locals.inc |
project-local zero-page aliases — empty for now (filled in Pass 2) |
linker.cfg |
PRG at $C000, 16 KB, fill = yes |
Makefile |
links reconstructed_prg.bin and cmps it against prg.bin |
reconstructed_prg.bin |
build output from the last verified build |
Header/CHR are reproduced verbatim from header.bin/chr.bin (not linked): make verifies PRG bytes only at this stage, which is exactly what a skeleton proves. When this project is promoted to a full disassembly, header.s / chr.s (as e.g. Burger Time (U)) and a full-ROM make target get added.
Build
cd "_wip/Urban Champion (JU)/copilot"
make # → cmp reconstructed_prg.bin prg.bin → "BYTE-IDENTICAL"
Next Steps (per PROMPTS.md)
- Pass 1 — replace the blanket
.incbinwith classified code/data: trace reachability from RESET ($CA00) and NMI ($CA91), emit per-instruction; PRG:$xxxx AA BBannotations, keep unreached bytes as explicit.byteblocks. - Pass 2 — replace
Label_/Sub_names with semantic routine names; filllocals.inc. - Pass 3 — name data tables/structures; release provisional flags.
- Promotion — move to a top-level
<name>/copilot/folder, add full-ROM build (header.s + chr.s + vectors), and write the power-on flowOVERVIEW.mdin the established style; then it joins the root index's numbered inventory.