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# mednafen_supergrafx - RetroBIOS

Type | libretro
Classification | community_fork
Source | https://github.com/libretro/beetle-supergrafx-libretro
Upstream | https://mednafen.github.io/
Version | v1.23.0
Profiled | 2026-03-24
Cores | mednafen_supergrafx
Systems | nec-pc-engine
Verification mode | existence

Technical notes

Fork of Mednafen's pce_fast module with SuperGrafx and CD support. Separate codebase from beetle_pce (mednafen/pce_fast/ vs mednafen/pce/). BIOS loaded via HuC_LoadCD() at CD-ROM load time. Core option "sgx_cdbios" selects which card image to use (default: System Card 3). DetectGECD() auto-detects Games Express discs and overrides to gexpress.pce. DetectSGXCD() detects SuperGrafx CD titles via magic bytes. Arcade Card mode (sgx_arcadecard option, not exposed) extends System Card 3 with extra RAM mapping. No hash or size validation on BIOS load. Upstream pce_fast module has a single pce_fast.cdbios string setting; the 4-option dropdown is a libretro addition. Upstream has no separate gecdbios setting (unlike the accurate pce module).

4 files | 1 required, 3 optional | 4 in repo, 0 missing

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

- Source: `libretro.cpp:972-973, mednafen/settings.cpp:37`
- Platforms: batocera, lakka, recalbox, retroarch, retrobat, retrodeck, retropie
- Default value for sgx_cdbios option.

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

- Source: `libretro.cpp:974-975`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- sgx_cdbios = 'System Card 2'.

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

- Source: `libretro.cpp:976-977`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- sgx_cdbios = 'System Card 1'.

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

- Source: `libretro.cpp:978-979, mednafen/pce_fast/pce.cpp:330-367,453-454`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- sgx_cdbios = 'Games Express' or auto-detected via DetectGECD().

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