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RetroBIOS

DirectXBox

DirectXBox emulates Microsoft Xbox. It reads 2 files, 2 of them required: without a required file it does not start games.

About this profile
Detail Value
Type libretro
Classification Pure libretro
Source https://github.com/libretro/libretro-directxbox
Version alpha, stated in src/libretro/libretro.cpp
Revision libretro/libretro-directxbox@8b6b80667506
Profiled 2026-03-23
Profile YAML, JSON
Cores directxbox
Systems Microsoft Xbox
Install this emulator's files

The installer finds your setup and its BIOS folder, then downloads only the files this emulator reads there and checks each one.

Open the Start menu. Type PowerShell and open it. Paste the line. Press Enter.

PowerShell
&([scriptblock]::Create((irm https://abdess.github.io/retrobios/i.ps1))) --emulator directxbox

Files

Section titled “Files”

2 files: 2 required, 0 optional.

In this collection: 2 in repo and 0 missing.

Required

Section titled “Required”

mcpx_1.0.bin required in repo

  • Xbox MCPX ROM (secret boot ROM on the southbridge). Contains the initial boot vector that loads the flash BIOS. Overlaid at the last 512 bytes of the 16 MB flash region (0xFFFFFE00-0xFFFFFFFF). Only needed for retail machine types. Debug and Chihiro skip this file.
Validation and source

cromwell_1024.bin required in repo

  • Cromwell open-source Xbox BIOS (1024 KB variant). Loaded as the flash ROM and mirrored across the 16 MB flash region at 0xFF000000. Size must be a multiple of 0x10000. This is the only BIOS that currently boots in the emulator. The Microsoft retail BIOS (xbox-3944.bin) is referenced in commented-out code but does not work yet.
Validation and source

Next steps

Section titled “Next steps”
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Maintained by Abdess on GitHub. Report a problem.

Packs from release v2026.10.10, .

MIT for the tooling and metadata. BIOS and firmware files are third-party system software, preserved for personal backup, archival and interoperability.