Skip to content

# 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

Fork of Mednafen's pce module (accurate, with SuperGrafx and CD support). Separate codebase from mednafen_pce_fast (mednafen/pce/ vs mednafen/pce_fast/). BIOS loaded via PCE_LoadCD() at CD-ROM load time. Core option "pce_cdbios" selects which card image to use (default: System Card 3). DetectGECD() auto-detects Games Express discs and overrides to gexpress.pce. Arcade Card mode (pce_arcadecard option, enabled by default) extends System Card 3 with extra RAM mapping. No hash or size validation on BIOS load. Upstream pce module has configurable pce.cdbios/pce.gecdbios string settings; the 6-option dropdown is a libretro addition.

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

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

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

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

- Source: `libretro.cpp:1053-1054`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- pce_cdbios = 'System Card 2'.

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

- 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

- Aliases: `gecard.pce`
- Source: `libretro.cpp:1057-1058, settings.cpp:41, pce.cpp:373-411`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- pce_cdbios = 'Games Express' or auto-detected via DetectGECD().

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

- Source: `libretro.cpp:1059-1060`
- Platforms: lakka, recalbox, retroarch, retropie
- pce_cdbios = 'System Card 3 US'. Not in .info.

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

- Source: `libretro.cpp:1061-1062`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- pce_cdbios = 'System Card 2 US'. Not in .info.

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