emulator: "VICE xscpu64"
type: libretro
core_classification: community_fork
source: "https://github.com/libretro/vice-libretro"
upstream: "https://sourceforge.net/projects/vice-emu/"
profiled_date: "2026-03-25"
core_version: "3.10"
display_name: "Commodore - C64 SuperCPU (VICE xscpu64)"
cores: [vice_xscpu64, xscpu64]
systems: [commodore-c64-supercpu]
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).

files:
  - name: "scpu-dos-2.04.bin"
    description: "CMD SuperCPU Kernal v2.04"
    required: false
    min_size: 65536
    max_size: 524288
    validation: [size]
    source_ref: "retrodep/ui.c:262-263, vice/src/scpu64/scpu64rom.c:75-89"
    note: "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/."

  - name: "scpu-dos-1.4.bin"
    description: "CMD SuperCPU Kernal v1.4"
    required: false
    min_size: 65536
    max_size: 524288
    validation: [size]
    source_ref: "retrodep/ui.c:265-266, vice/src/scpu64/scpu64rom.c:75-89"
    note: "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/."

  - name: "JiffyDOS_1541-II.bin"
    description: "JiffyDOS 1541-II drive DOS replacement"
    required: false
    source_ref: "retrodep/ui.c:282-283"
    note: "Loaded as DosName1541ii when JiffyDOS option enabled."

  - name: "JiffyDOS_1571_repl310654.bin"
    description: "JiffyDOS 1571 drive DOS replacement"
    required: false
    source_ref: "retrodep/ui.c:285-286"
    note: "Loaded as DosName1571 when JiffyDOS option enabled."

  - name: "JiffyDOS_1581.bin"
    description: "JiffyDOS 1581 drive DOS replacement"
    required: false
    source_ref: "retrodep/ui.c:287-288"
    note: "Loaded as DosName1581 when JiffyDOS option enabled."