# 100thCoin/AccuracyCoin

A large collection of NES accuracy tests on a single NROM cartridge.

Repository: https://github.com/100thCoin/AccuracyCoin
Canonical: https://ross.abutalabs.com/products/accuracycoin
Language: Assembly
License: MIT
License Family: permissive
Last push: 2026-09-02T00:21:20+00:00

## Health v2 (maintenance only)
Score: 64/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 100, release rhythm 35, longevity 34
- inputs: {"age_days": 481, "days_push": 1, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1037, forks 22 (observed 2026-09-03T02:15:00.403818+00:00)

## What it is
AccuracyCoin is a NES test ROM that packs 141 hardware accuracy tests onto a single NROM cartridge, targeting an NTSC console with an RP2A03G CPU and RP2C02G PPU. Each test prints PASS or FAIL on screen with error codes on failure, plus a debug menu and a summary results table for evaluating emulator and flash-cart fidelity against real hardware.

## Use cases
- test how accurate my NES emulator is against real hardware
- verify CPU and PPU emulation correctness with conformance tests
- check emulator handling of unofficial 6502 instructions
- compare NES emulators by running a standardized accuracy test suite
- debug emulator failures using on-screen error codes and RAM values
- validate a flash cartridge or Everdrive setup on a real NTSC console

## When to choose
- You are developing a NES emulator and need a comprehensive accuracy/conformance test suite
- You want to measure how closely an emulator matches real NTSC NES hardware behavior
- You need per-test PASS/FAIL results with error codes and debug output for emulator debugging

## When to avoid
- You target PAL consoles or non-RP2A03G/RP2C02G hardware revisions, where some tests may skip or misbehave
- You need a general-purpose 6502 assembler, NES development SDK, or library to build your own ROMs
- You are testing non-NES retro platforms such as Game Boy or SNES

## Facets
- artifact type: application
- maturity: active
- function: testing, developer-tools
- domain: gaming-tools, developer-tools, testing, hardware
- platform: embedded, cross-platform
- tags: nes, emulator-testing, accuracy-tests, test-rom, 6502-assembly, retro-gaming, console-hardware, nrom-cartridge

## Member repositories
- 100thCoin/AccuracyCoin (main) score 64

## Provenance
- Observed fields: from GitHub, fetched 2026-09-03T02:15:00.403818+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T07:06:29.587126+00:00, confidence not recorded.
  - readme: https://github.com/100thCoin/AccuracyCoin (fetched 2026-09-03T02:15:00.403818+00:00, sha ba7f00925a8b)
- Data as of 2026-08-30T08:39:29.467469+00:00.