mednafen_supergrafx - RetroBIOS¶
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 in repo japan
CD-ROM System Card 3.0 (Japan)
- Source:
libretro.cpp:972-973,mednafen/settings.cpp:37 - Platforms: batocera, lakka, recalbox, retroarch, retrobat, retrodeck, retropie, romm
- Default value for sgx_cdbios option.
syscard2.pce optional in repo japan
CD-ROM System Card 2.0 (Japan)
syscard1.pce optional in repo japan
CD-ROM System Card 1.0 (Japan)
gexpress.pce optional in repo japan
Games Express CD Card
- Source:
libretro.cpp:978-979,mednafen/pce_fast/pce.cpp:330-367,mednafen/pce_fast/pce.cpp:453-454 - Platforms: lakka, recalbox, retroarch, retrodeck, retropie, romm
- sgx_cdbios = 'Games Express' or auto-detected via DetectGECD().
Generated on 2026-08-23T16:12:06Z