# Digimon Digital Card Battle: a three-region matching decompilation

> dcb_decomp reconstructs the PlayStation Digimon Digital Card Battle executable and overlays in C and assembly for US, Japanese and European releases. The author reports byte-identical builds of game code and data from one source tree, measured with objdiff. The repository records remaining source-form workarounds and assembly in linked PsyQ library code.

- 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/ReGame-Labs/dcb_decomp>
- Primary source: <https://github.com/ReGame-Labs/dcb_decomp/blob/6c9caf124450cafa1b5f402d03d82b90bb02d16e/README.md>
- Catalog page: <https://awesomerea.org/resources/dcb-decomp-case/>
- Record JSON: <https://awesomerea.org/resources/dcb-decomp-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/dcb-decomp-case/index.md)

## Requirements & limits

- **Prerequisites:** Supply your own copy of the game for the chosen region.
- **Limits:** The author reports fully matching game code and data; some PsyQ library functions remain in assembly.
- **License:** MIT licence.

## Primary sources

1. <https://github.com/ReGame-Labs/dcb_decomp/blob/6c9caf124450cafa1b5f402d03d82b90bb02d16e/README.md>
2. <https://github.com/ReGame-Labs/dcb_decomp/blob/6c9caf124450cafa1b5f402d03d82b90bb02d16e/TODO.md>

## More in Games

- [Digimon Rumble Arena: matching PlayStation decompilation](https://awesomerea.org/resources/digimon-rumble-arena-decomp-case/index.md) · Case study
- [Digimon World 2003: byte-matching decompilation and PC port](https://awesomerea.org/resources/dw2003-recomp/index.md) · Case study
- [Digimon World 2: a matching PlayStation decompilation](https://awesomerea.org/resources/digimon-world-2-decomp-case/index.md) · Case study
- [Digimon World 3: matching PlayStation decompilation of three regional releases](https://awesomerea.org/resources/digimon-world-3-decomp-case/index.md) · Case study
- [Digimon World 4: a matching PS2 decompilation](https://awesomerea.org/resources/digimon-world-4-decomp-case/index.md) · Case study
- [Digimon World DS: matching Nintendo DS decompilation](https://awesomerea.org/resources/digimon-world-ds-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.