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Promotes Donkey Kong Jr

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Adds remaining NROM as _wip
Update gitignore to not keep object files
Adds AGENTS.md as this is an AI helped project
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tmerritt committed 2026-10-16 13:46:20 -04:00
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_wip/Popeye (JU) (PRG 1)/OVERVIEW.md
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# Popeye (JU) (PRG 1) — Skeleton Project
ROM: `_wip/Popeye (JU) (PRG 1)/Popeye (JU) (PRG 1) [!].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.
**Companion note:** `Popeye (JU) (PRG 0)` holds a different PRG image of the same title (different mirroring flag, too). Neither is currently known to be a superset of the other.
## 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 | Vertical |
| Battery-backed flag | clear |
| ROM SHA-256 | `0016065132a2dc98afb1181a735edcb9c656b0b89af4e0771e94807ba67bd8b4` |
| PRG SHA-256 | `72f06b36f4e908e15639564e83a32e0afe680189e82f0f9d7fa5a9fadaa2e646` |
## Interrupt Vectors (taken from PRG $3FFA–$3FFF)
| Vector | Target | Note |
|--------|--------|------|
| NMI | `$C701` | per-frame heartbeat |
| RESET | `$C649` | enters at $C649 inside the first pages (the Donkey Kong Jr.-style non-$C000 entry) |
| IRQ | `$FFF0` | lands in the vector-page padding — unused placeholder |
## `copilot/` Contents
| File | Purpose |
|------|---------|
| `Popeye (JU) (PRG 1) [!].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 $C000, 16 KB, `fill = yes` |
| `Makefile` | links `reconstructed_prg.bin` and `cmp`s it against `prg.bin` |
| `reconstructed_prg.bin` | build output from the last verified build |
Header/CHR are reproduced verbatim from `header.bin`/`chr.bin` (not linked): `make` verifies **PRG bytes only** at this stage, which is exactly what a skeleton proves. When this project is promoted to a full disassembly, `header.s` / `chr.s` (as e.g. `Burger Time (U)`) and a full-ROM `make` target get added.
## Build
```bash
cd "_wip/Popeye (JU) (PRG 1)/copilot"
make # → cmp reconstructed_prg.bin prg.bin → "BYTE-IDENTICAL"
```
## Next Steps (per `PROMPTS.md`)
1. **Pass 1** — replace the blanket `.incbin` with classified code/data: trace reachability from RESET ($C649) and NMI ($C701), emit per-instruction `; PRG:$xxxx AA BB` annotations, keep unreached bytes as explicit `.byte` blocks.
2. **Pass 2** — replace `Label_`/`Sub_` names with semantic routine names; fill `locals.inc`.
3. **Pass 3** — name data tables/structures; release provisional flags.
4. **Promotion** — move to a top-level `<name>/copilot/` folder, add full-ROM build (header.s + chr.s + vectors), and write the power-on flow `OVERVIEW.md` in the established style; then it joins the root index's numbered inventory.