# Xenosaga Episode I: an early PS2 matching decompilation

> Xenosaga-I-Decomp recovers C functions from the NTSC-U PS2 executable of Xenosaga Episode I and compares compiled bytes with the original ELF. Its tools split the executable, extract symbols and track decompilation progress. The author reports a byte-matching full executable build with a small fraction of functions rewritten in C; Japanese releases are planned.

- 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/ValakTurtle/Xenosaga-I-Decomp>
- Primary source: <https://github.com/ValakTurtle/Xenosaga-I-Decomp/blob/ab6aaa26b60bd1936c26266bdd8c2e0b7be9ba5d/README.md>
- Catalog page: <https://awesomerea.org/resources/xenosaga-i-decomp-case/>
- Record JSON: <https://awesomerea.org/resources/xenosaga-i-decomp-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/xenosaga-i-decomp-case/index.md)

## Requirements & limits

- **Prerequisites:** A legally obtained NTSC-U game copy and its SLUS_204.69 ELF are required.
- **Prerequisites:** The documented setup uses WSL2, Ubuntu 24 or native Linux and installs PS2DEV and EE-GCC tooling.
- **Limits:** The C decompilation is at an early stage; Japanese versions are planned.
- **License:** No licence file in the repository.

## Primary sources

1. <https://github.com/ValakTurtle/Xenosaga-I-Decomp/blob/ab6aaa26b60bd1936c26266bdd8c2e0b7be9ba5d/README.md>
2. <https://github.com/ValakTurtle/Xenosaga-I-Decomp/blob/ab6aaa26b60bd1936c26266bdd8c2e0b7be9ba5d/CONTRIBUTING.md>

## More in Games

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- [xmen2disasm: rebuilding X-Men 2 from a matching disassembly](https://awesomerea.org/resources/xmen2disasm-case/index.md) · Case study
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- [Yu-Gi-Oh! Forbidden Memories: a matching PlayStation decompilation](https://awesomerea.org/resources/ygofm-decomp-case/index.md) · Case study
- [Yu-Gi-Oh! Forbidden Memories: a regional byte-matching PlayStation decompilation](https://awesomerea.org/resources/yu-gi-oh-forbidden-memories-decomp-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.