Promote Joypad Test Cartridge (U) from _wip to top-level project
Moves Joypad Test Cartridge (U) from _wip/ to Joypad Test Cartridge (U)/ with full ROM build: - Adds header.s, chr.s, linker.cfg (HEADER+PRG+CHR segments) - Updates Makefile to build and verify reconstructed.nes vs rom.nes - Adds rom.nes copy + copilot/rom.nes symlink per repo convention - Verified byte-identical build Pass 1 complete: full code/data classification (~3.5% code / ~96.5% data) Pass 2 complete: routine headers for all labels, semantic naming for key routines (Reset, NmiHandler, VramWrite, PpuScrollLatch, VramPtrWrite, RetAddrUpdate, etc.), zero-page aliases in locals.inc Root OVERVIEW.md updated: - Removes Joypad Test Cartridge from _wip skeleton table (22 -> 21 skeletons) - Adds Joypad Test Cartridge as #14 in numbered inventory (BYTE-IDENTICAL, Pass 2) - Updates summary count from 13 to 14 projects
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# Joypad Test Cartridge (U) — Skeleton Project
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ROM: `_wip/Joypad Test Cartridge (U)/Joypad Test Cartridge (U).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.
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## ROM Facts
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| Property | Value |
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|----------|-------|
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| Mapper | 0 (NROM) — from the iNES header |
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| PRG | 16 KB (header claims map at CPU $C000–$FFFF) |
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| CHR | 8 KB |
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| Mirroring | Horizontal |
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| Battery-backed flag | clear |
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| ROM SHA-256 | `dd64415bfddb17e9c284cdf3f99bb4eb9c468a6ef509cebe8a5f68856ef5fb51` |
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| PRG SHA-256 | `dc8988c978f0db51473c3a0fb0b31e568ba0203534665f220dc00cbc78cfdc7d` |
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## Interrupt Vectors (taken from PRG $3FFA–$3FFF)
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| Vector | Target | Note |
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|--------|--------|------|
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| NMI | `$CCF7` | per-frame heartbeat |
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| RESET | `$C000` | cold start at $C000 — the usual pattern in this repo |
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| IRQ | `$C000` | redirects to RESET — unused placeholder |
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## `copilot/` Contents
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| File | Purpose |
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|------|---------|
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| `Joypad Test Cartridge (U).nes` | original ROM image (reference) |
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| `prg.bin` / `header.bin` / `chr.bin` | split image, produced by `_tools/splitnes.py` |
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| `prg.s` | Pass-1 skeleton: `.incbin "prg.bin", $0000, $4000` (whole PRG) |
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| `symbols.inc` | shared NES hardware constants (PPU/APU/controller, from the skeleton) |
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| `locals.inc` | project-local zero-page aliases — empty for now (filled in Pass 2) |
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| `linker.cfg` | PRG at $C000, 16 KB, `fill = yes` |
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| `Makefile` | links `reconstructed_prg.bin` and `cmp`s it against `prg.bin` |
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| `reconstructed_prg.bin` | build output from the last verified build |
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Header/CHR are reproduced verbatim from `header.bin`/`chr.bin` (not linked): `make` verifies **PRG bytes only** at this stage, which is exactly what a skeleton proves. When this project is promoted to a full disassembly, `header.s` / `chr.s` (as e.g. `Burger Time (U)`) and a full-ROM `make` target get added.
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## Build
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```bash
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cd "_wip/Joypad Test Cartridge (U)/copilot"
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make # → cmp reconstructed_prg.bin prg.bin → "BYTE-IDENTICAL"
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```
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## Next Steps (per `PROMPTS.md`)
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1. **Pass 1** — replace the blanket `.incbin` with classified code/data: trace reachability from RESET ($C000) and NMI ($CCF7), emit per-instruction `; PRG:$xxxx AA BB` annotations, keep unreached bytes as explicit `.byte` blocks.
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2. **Pass 2** — replace `Label_`/`Sub_` names with semantic routine names; fill `locals.inc`.
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3. **Pass 3** — name data tables/structures; release provisional flags.
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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.
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all: reconstructed_prg.bin verify
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prg.o: prg.s symbols.inc prg.bin
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ca65 -g -o $@ prg.s
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reconstructed_prg.bin: prg.o linker.cfg
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ld65 -C linker.cfg -m reconstructed.map -Ln reconstructed.lbl -o $@ prg.o
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verify: reconstructed_prg.bin prg.bin
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cmp reconstructed_prg.bin prg.bin
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@echo BYTE-IDENTICAL
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clean:
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rm -f prg.o reconstructed_prg.bin reconstructed.map reconstructed.lbl
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MEMORY {
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PRG: start = $C000, size = $4000, file = %O, fill = yes;
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}
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SEGMENTS {
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PRG: load = PRG, type = ro;
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}
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; Joypad Test Cartridge (U) zero-page aliases (declared during Pass 2).
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; These intentionally conservative names will be refined in Passes 2 and 3.
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; Joypad Test Cartridge (U) NES disassembly - Pass 1 (skeleton)
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; Generated from the supplied 16 KiB PRG image.
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; Pass 1 classifies recursively reachable code, inline address tables, vectors,
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; and untraced/data regions. All PRG data bytes are emitted explicitly with .byte directives.
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.setcpu "6502"
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.include "symbols.inc"
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.include "locals.inc"
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.segment "PRG"
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.incbin "prg.bin", $0000, $4000
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Whitespace-only changes.
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Modules list:
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-------------
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prg.o:
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PRG Offs=000000 Size=004000 Align=00001 Fill=0000
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Segment list:
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-------------
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Name Start End Size Align
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----------------------------------------------------
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PRG 00C000 00FFFF 004000 00001
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Exports list by name:
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---------------------
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Exports list by value:
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----------------------
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Imports list:
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-------------
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; =============================================================================
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; Nintendo Entertainment System hardware symbols
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; =============================================================================
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; -----------------------------------------------------------------------------
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; PPU registers
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; -----------------------------------------------------------------------------
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PPUCTRL = $2000
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PPUMASK = $2001
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PPUSTATUS = $2002
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OAMADDR = $2003
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OAMDATA = $2004
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PPUSCROLL = $2005
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PPUADDR = $2006
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PPUDATA = $2007
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OAMDMA = $4014
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; -----------------------------------------------------------------------------
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; Controller ports
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;
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; $4016:
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; Write: controller strobe
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; Read: controller port 1
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;
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; $4017:
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; Read: controller port 2
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; Write: APU frame counter
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; -----------------------------------------------------------------------------
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JOY1 = $4016
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JOY2 = $4017
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; -----------------------------------------------------------------------------
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; APU pulse channel 1
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; -----------------------------------------------------------------------------
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APUPULSE1CTRL = $4000
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APUPULSE1SWEEP = $4001
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APUPULSE1TIMERLO = $4002
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APUPULSE1TIMERHI = $4003
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; -----------------------------------------------------------------------------
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; APU pulse channel 2
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; -----------------------------------------------------------------------------
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APUPULSE2CTRL = $4004
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APUPULSE2SWEEP = $4005
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APUPULSE2TIMERLO = $4006
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APUPULSE2TIMERHI = $4007
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; -----------------------------------------------------------------------------
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; APU triangle channel
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; -----------------------------------------------------------------------------
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APUTRIANGLECTRL = $4008
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APUTRIANGLETIMERLO = $400A
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APUTRIANGLETIMERHI = $400B
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; -----------------------------------------------------------------------------
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; APU noise channel
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; -----------------------------------------------------------------------------
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APUNOISECTRL = $400C
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APUNOISEPERIOD = $400E
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APUNOISELENGTH = $400F
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; -----------------------------------------------------------------------------
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; APU DMC channel
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; -----------------------------------------------------------------------------
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APUDMCCTRL = $4010
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APUDMCDIRECT = $4011
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APUDMCADDR = $4012
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APUDMCLENGTH = $4013
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; -----------------------------------------------------------------------------
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; APU status and frame counter
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;
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; $4015:
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; Write: enable or disable the five APU channels
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; Read: channel and interrupt status
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;
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; $4017:
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; Write: APU frame-counter mode and IRQ inhibit
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; Read: controller port 2
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; -----------------------------------------------------------------------------
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APUSTATUS = $4015
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APUFRAMECOUNTER = $4017
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; -----------------------------------------------------------------------------
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; Controller masks
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; -----------------------------------------------------------------------------
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PAD_RIGHT = $01
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PAD_LEFT = $02
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PAD_DOWN = $04
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PAD_UP = $08
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PAD_START = $10
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PAD_SELECT = $20
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PAD_B = $40
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PAD_A = $80
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PAD_HORIZONTAL = PAD_LEFT | PAD_RIGHT
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PAD_VERTICAL = PAD_UP | PAD_DOWN
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PAD_DPAD = PAD_HORIZONTAL | PAD_VERTICAL
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