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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)

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

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

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