# OB64 Decomp: matching Ogre Battle 64 from MIPS assembly to C

> Reconstructs the US Rev 0 release of Ogre Battle 64 from source-owned MIPS assembly, replacing accepted functions with C that matches linked bytes and the full ROM. Its workflow records compiler and relocation constraints, tests each replacement, and keeps the original ROM and toolchains outside the repository.

- 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/rempred/OB64-Decomp>
- Primary source: <https://github.com/rempred/OB64-Decomp/blob/0b972a783252620b587cc623f16551444dd9f7d1/README.md>
- Catalog page: <https://awesomerea.org/resources/ogre-battle-64-decomp-case/>
- Record JSON: <https://awesomerea.org/resources/ogre-battle-64-decomp-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/ogre-battle-64-decomp-case/index.md)

## Requirements & limits

- **Prerequisites:** A legally obtained Ogre Battle 64 US Rev 0 ROM is required; US Rev 1 is outside the project's scope.
- **Prerequisites:** The documented matching setup uses Windows, Node.js, a pinned KMC GCC 2.7.2 toolchain, Splat, and GNU Binutils.
- **Scope:** Semantic identification remains separate from byte-matching progress.
- **License:** MIT License.

## Primary sources

1. <https://github.com/rempred/OB64-Decomp/blob/0b972a783252620b587cc623f16551444dd9f7d1/README.md>
2. <https://github.com/rempred/OB64-Decomp/blob/0b972a783252620b587cc623f16551444dd9f7d1/LICENSE>

## More in Games

- [Ocarina of Time 3D: a hash-checked 3DS decompilation](https://awesomerea.org/resources/ocarina-of-time-3d-decomp-case/index.md) · Case study
- [Ocarina of Time Master Quest: matching debug disassembly](https://awesomerea.org/resources/ocarina-mq-debug-disasm/index.md) · Case study
- [Ocarina of Time: decompilation with MD5-checked ROM builds for 16 versions](https://awesomerea.org/resources/ocarina-of-time-decomp-case/index.md) · Case study
- [Okamiden: a work-in-progress Nintendo DS matching decompilation](https://awesomerea.org/resources/okamiden-decomp-case/index.md) · Case study
- [oot-vc: decompiling the Wii Virtual Console N64 emulator](https://awesomerea.org/resources/oot-vc-case/index.md) · Case study
- [open-spyro: matching decompilation of Spyro the Dragon](https://awesomerea.org/resources/open-spyro-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.