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# Beetle PCE (Mednafen PCE) - RetroBIOS

Type | libretro
Classification | community_fork
Source | https://github.com/libretro/beetle-pce-libretro
Upstream | https://mednafen.github.io/
Version | v0.9.38.7
Profiled | 2026-03-24
Cores | mednafen_pce
Systems | nec-pc-engine
Verification mode | existence

Technical notes

Libretro port of Mednafen's PCE-Accurate module. BIOS loaded from system directory at CD-ROM load time via PCE_LoadCD() in pce.cpp:441-460. Core option "pce_cdbios" selects which card image to use (default: System Card 3). DetectGECD() auto-detects Games Express discs and switches to gexpress.pce. Arcade Card mode (pce_arcadecard option, enabled by default) extends System Card 3 with extra RAM mapping via SYSCARD_ARCADE enum. No hash or size validation on BIOS load: file_open() then HuC_Load() reads data directly. DetectSGXCD() reads sector data to decide SGX mode but uses the same BIOS files.

6 files | 1 required, 5 optional | 6 in repo, 0 missing

`syscard3.pce` -required, NTSC-J : CD-ROM System Card 3.0 (Japan)

- SHA1: `79f5ff55dd10187c7fd7b8daab0b3ffbd1f56a2c`
- MD5: `38179df8f4ac870017db21ebcbf53114`
- Source: `libretro.cpp:1051-1052, settings.cpp:40`
- Platforms: batocera, lakka, recalbox, retroarch, retrobat, retrodeck, retropie
- Default value for pce_cdbios option.

`syscard3u.pce` -optional, NTSC-U : CD-ROM System Card 3.0 (US / TurboGrafx-CD)

- SHA1: `d02611d99921986147c753df14c7349b31d71950`
- MD5: `0754f903b52e3b3342202bdafb13efa5`
- Source: `libretro.cpp:1059-1060`
- Platforms: lakka, recalbox, retroarch, retropie
- pce_cdbios = 'System Card 3 US'

`syscard2.pce` -optional, NTSC-J : CD-ROM System Card 2.0 (Japan)

- SHA1: `88da02e2503f7c32810f5d93a34849d470742b6d`
- MD5: `3cdd6614a918616bfc41c862e889dd79`
- Source: `libretro.cpp:1053-1054`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- pce_cdbios = 'System Card 2'

`syscard2u.pce` -optional, NTSC-U : CD-ROM System Card 2.0 (US / TurboGrafx-CD)

- SHA1: `2bea3dac98f84b2f2f469fa77ea720b8770d598d`
- MD5: `94279f315e8b52904f65ab3108542afe`
- Source: `libretro.cpp:1061-1062`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- pce_cdbios = 'System Card 2 US'

`syscard1.pce` -optional, NTSC-J : CD-ROM System Card 1.0 (Japan)

- SHA1: `a39a66da7de6ba94ab84d04eef7afeec7d4ee66a`
- MD5: `2b7ccb3d86baa18f6402c176f3065082`
- Source: `libretro.cpp:1055-1056`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- pce_cdbios = 'System Card 1'

`gexpress.pce` -optional, NTSC-J : Games Express CD Card

- SHA1: `014881a959e045e00f4db8f52955200865d40280`
- MD5: `6d2cb14fc3e1f65ceb135633d1694122`
- Aliases: `gecard.pce`
- Source: `libretro.cpp:1057-1058, settings.cpp:41, pce.cpp:374-411`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- pce_cdbios = 'Games Express' or auto-detected via DetectGECD().

Generated on 2026-03-25T14:56:43Z