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# mednafen_pce_fast - RetroBIOS

Type | libretro
Classification | community_fork
Source | https://github.com/libretro/beetle-pce-fast-libretro
Upstream | https://mednafen.github.io/
Version | v1.31.0.0
Profiled | 2026-03-24
Cores | mednafen_pce_fast
Systems | nec-pc-engine
Verification mode | existence

Technical notes

Fork of Mednafen's pce_fast module (speed-optimized, no SuperGrafx support). Separate codebase from beetle_pce (mednafen/pce_fast/ vs mednafen/pce/). BIOS loaded via HuCLoadCD() at CD-ROM load time. Core option "pce_fast_cdbios" selects which card image to use (default: System Card 3). No Games Express auto-detection (unlike beetle_pce); user must select manually. No hash or size validation on BIOS load. Upstream pce_fast module only has a single pce_fast.cdbios string setting; 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:67, libretro.cpp:1755-1760`
- Platforms: batocera, lakka, recalbox, retroarch, retrobat, retrodeck, retropie
- Default value for pce_fast_cdbios option.

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

- Source: `libretro.cpp:1762`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- pce_fast_cdbios = 'System Card 2'.

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

- Source: `libretro.cpp:1764`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- pce_fast_cdbios = 'System Card 1'.

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

- Aliases: `gecard.pce`
- Source: `libretro.cpp:1765-1766`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- pce_fast_cdbios = 'Games Express'. For unlicensed Games Express titles.

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

- Source: `libretro.cpp:1767-1768`
- Platforms: lakka, recalbox, retroarch, retropie
- pce_fast_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:1769-1770`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- pce_fast_cdbios = 'System Card 2 US'. Not in .info.

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