# Dr. Mario: a hash-checked NES disassembly

> Dr. Mario reconstructs the NES game's original NTSC and revision A releases as ca65 6502 assembly. The build extracts art from the user's original ROM, assembles both variants, and compares their MD5 hashes with expected outputs.

- Type: Case study
- Targets: Game
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/brianhuffman/drmario>
- Primary source: <https://github.com/brianhuffman/drmario/blob/7e23e96bd9ab83d8371a1cf53d312c0436722746/README.md>
- Catalog page: <https://awesomerea.org/resources/dr-mario-nes-disassembly-case/>
- Record JSON: <https://awesomerea.org/resources/dr-mario-nes-disassembly-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/dr-mario-nes-disassembly-case/index.md)

## Requirements & limits

- **Prerequisites:** The ca65 and ld65 tools from cc65 are required.
- **Prerequisites:** An unzipped original Dr. Mario .nes ROM, named drmario_original.nes, is required to extract art assets.
- **License:** No licence file in the repository.

## Primary sources

1. <https://github.com/brianhuffman/drmario/blob/7e23e96bd9ab83d8371a1cf53d312c0436722746/README.md>
2. <https://github.com/brianhuffman/drmario/blob/7e23e96bd9ab83d8371a1cf53d312c0436722746/Makefile>

## More in Games

- [Dragon Ball Z: Budokai Tenkaichi 3 — byte-exact PlayStation 2 decompilation](https://awesomerea.org/resources/bt3-decompiled/index.md) · Case study
- [Dragon Ball Z: L'Appel du Destin: rebuilding the Mega Drive ROM from source](https://awesomerea.org/resources/dbzbr-disasm-case/index.md) · Case study
- [Dragon Quest II: rebuilding NES releases from disassembly](https://awesomerea.org/resources/dragon-quest-ii-nes-disassembly-case/index.md) · Case study
- [Dragon Quest IV: a Nintendo DS decompilation of the European release](https://awesomerea.org/resources/dqiv-decomp-case/index.md) · Case study
- [Dragon Quest IX: matching Nintendo DS decompilation](https://awesomerea.org/resources/dqix-decomp-case/index.md) · Case study
- [Dragon Warrior 3: a matching Game Boy Color disassembly](https://awesomerea.org/resources/dragon-warrior-3-gbc-disassembly-case/index.md) · Case study

## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.