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VICE xscpu64 - RetroBIOS
Type libretro
Classification community_fork
Source https://github.com/libretro/vice-libretro
Upstream https://sourceforge.net/projects/vice-emu/
Version 3.10
Profiled 2026-03-25
Cores vice_xscpu64
Systems commodore-c64-supercpu
Technical notes

Embedded SCPU64 ROM V0.07 (free replacement by Soci/Singular, 64 KB), chargen (901225-01, 906143-02), C64 BASIC (901226-01), all C64 kernals (Rev 3, GS, SX-64, 4064, Japanese), all drive ROMs (1540 through 9000), and VIC-II palettes. Embedded ROM check in sysfile_load takes priority over filesystem. External scpu-dos-*.bin provide the original CMD SuperCPU DOS kernals, loaded from system/vice/SCPU64/ when SuperCPU Kernal core option is changed from Internal. JiffyDOS requires True Drive Emulation enabled and a non-internal SuperCPU kernal (the internal ROM is not JiffyDOS-compatible). The .info incorrectly declares JiffyDOS_C64.bin (firmware_count=4); the C64 kernal replacement is only loaded for x64/x64sc/x128, never for xscpu64. Correct firmware_count=5 (2 SCPU64 kernals + 3 JiffyDOS drive DOSes).

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

scpu-dos-2.04.bin -optional : CMD SuperCPU Kernal v2.04

  • Size: min 64.0 KB, max 512.0 KB
  • Validation: size
  • Source: retrodep/ui.c:262-263, vice/src/scpu64/scpu64rom.c:75-89
  • Platforms: lakka, recalbox, retroarch, retropie
  • Loaded as SCPU64Name when SuperCPU Kernal option set to 2.04. Size must be power of 2 between 64 KB and 512 KB. Stored in system/vice/SCPU64/.

scpu-dos-1.4.bin -optional : CMD SuperCPU Kernal v1.4

  • Size: min 64.0 KB, max 512.0 KB
  • Validation: size
  • Source: retrodep/ui.c:265-266, vice/src/scpu64/scpu64rom.c:75-89
  • Platforms: lakka, recalbox, retroarch, retropie
  • Loaded as SCPU64Name when SuperCPU Kernal option set to 1.40. Size must be power of 2 between 64 KB and 512 KB. Stored in system/vice/SCPU64/.

JiffyDOS_1541-II.bin -optional : JiffyDOS 1541-II drive DOS replacement

JiffyDOS_1571_repl310654.bin -optional : JiffyDOS 1571 drive DOS replacement

JiffyDOS_1581.bin -optional : JiffyDOS 1581 drive DOS replacement

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