Skip to content

# VICE x64sc - 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_x64sc
Systems | commodore-c64

Technical notes

Cycle-accurate C64 emulator using the viciisc VIC-II implementation. System ROMs embedded in binary: C64 BASIC (901226-01), chargen (901225-01), chargen Japanese (906143-02), kernal Rev 3 (901227-03), kernal GS (390852-01), kernal SX-64 (251104-04), kernal 4064 (901246-01), kernal Japanese (906145-02), plus all drive ROMs (1540, 1541, 1541-II, 1551, 1570, 1571, 1571CR, 1581, 1001, 2031, 2040, 3040, 4040, 9000) and VIC-II palettes. Embedded ROM check in sysfile_load takes priority over filesystem. Kernal Rev 1 (901227-01) and Rev 2 (901227-02) are NOT embedded; selecting C64 OLD NTSC or C64 OLD PAL model requires them on the filesystem in system/vice/C64/. JiffyDOS requires True Drive Emulation enabled and a 1541/1571/1581 drive type. SX-64 models use a separate JiffyDOS kernal (JiffyDOS_SX-64.bin) not declared in the .info.

7 files | 0 required, 7 optional | 6 in repo, 1 missing

`JiffyDOS_C64.bin` -optional : JiffyDOS C64 kernal replacement

- Source: `retrodep/ui.c:302-303`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- Loaded into KernalName when vice_jiffydos option is enabled (non-SX64 models).

`JiffyDOS_SX-64.bin` -optional, missing from repo : JiffyDOS SX-64 kernal replacement

- Source: `retrodep/ui.c:295-296`
- Loaded into KernalName when vice_jiffydos option is enabled and SX-64 model selected.

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

- Source: `retrodep/ui.c:283-284`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- Loaded into DosName1541ii when vice_jiffydos option is enabled.

`JiffyDOS_1571_repl310654.bin` -optional : JiffyDOS 1571 drive DOS replacement

- Source: `retrodep/ui.c:285-286`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- Loaded into DosName1571 when vice_jiffydos option is enabled.

`JiffyDOS_1581.bin` -optional : JiffyDOS 1581 drive DOS replacement

- Source: `retrodep/ui.c:287-288`
- Platforms: lakka, recalbox, retroarch, retrodeck, retropie
- Loaded into DosName1581 when vice_jiffydos option is enabled.

`kernal-901227-01.bin` -optional : C64 Kernal Rev 1

- Size: 8.0 KB
- Validation: size
- Source: `vice/src/c64/c64-resources.c:253, vice/src/c64/c64scmodel.c:141`
- Not embedded. Loaded via sysfile from system/vice/C64/ when C64 OLD NTSC model selected.

`kernal-901227-02.bin` -optional : C64 Kernal Rev 2

- Size: 8.0 KB
- Validation: size
- Source: `vice/src/c64/c64-resources.c:254, vice/src/c64/c64scmodel.c:123`
- Not embedded. Loaded via sysfile from system/vice/C64/ when C64 OLD PAL model selected.

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