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Caprice32 - RetroBIOS
Type standalone + libretro
Classification Community forks
Source https://github.com/libretro/libretro-cap32
Upstream https://github.com/ColinPitrat/caprice32
Version v4.2.0
Profiled 2026-03-23
Cores cap32, caprice32
Systems amstrad-cpc
Platform details

bios_mapping: - source_ref: cap32/cap32.c:1075-1103, cap32/cap32.c:345-348 - note: All ROMs are embedded. emulator_select_ROM() copies the appropriate

ROM array into the pbROM buffer based on CPC.model. No filesystem lookup occurs in the libretro port. The retro_system_bios_directory variable is set up in libretro/libretro-core.c:1513-1524 but only used for a future custom BIOS feature that is not yet implemented.

**embedded_roms:**
- source_ref: cap32/rom/464.h, cap32/rom/6128.h, cap32/rom/amsdos.h, cap32/rom/6128p.h, cap32/rom/cpm.h
- note: 5 ROM sets embedded as C arrays:

OS_BASIC10 (32KB) - CPC 464/664 OS + BASIC 1.0 OS_BASIC11 (32KB) - CPC 6128 OS + BASIC 1.1 AMSDOS (16KB) - Disk controller ROM, mapped to slot 7 OS_6128P - CPC+ system cartridge (White Label cartridge) cpmROM (128KB+) - CP/M boot snapshot including SNA header

**model_rom_map:**
- source_ref: cap32/cap32.c:1075-1103
- note: CPC 464:  OS_BASIC10 only (no disk support)

CPC 664: OS_BASIC10 + AMSDOS in ROM slot 7 CPC 6128: OS_BASIC11 + AMSDOS in ROM slot 7 CPC+: 6128P system cartridge (or user-provided .cpr file)

Technical notes

Caprice32 is an Amstrad CPC emulator ported to libretro. Supports CPC 464, CPC 664, CPC 6128, and CPC+ (Plus) models.

All system ROMs are compiled directly into the core binary as C header arrays in cap32/rom/*.h. No external BIOS files are required.

Embedded ROMs (cap32/cap32.c:345-348): - cap32/rom/464.h: OS_BASIC10[32768] - CPC 464 OS + BASIC 1.0 - cap32/rom/6128.h: OS_BASIC11[32768] - CPC 6128 OS + BASIC 1.1 - cap32/rom/amsdos.h: AMSDOS[16384] - AMSDOS disk controller ROM - cap32/rom/6128p.h: OS_6128P - CPC+ system cartridge ROM - cap32/rom/cpm.h: cpmROM - CP/M boot snapshot (128KB)

ROM selection in emulator_select_ROM() (cap32/cap32.c:1075-1103): - CPC 464: OS_BASIC10 (32KB) - CPC 664: OS_BASIC10 (32KB) + AMSDOS in slot 7 - CPC 6128: OS_BASIC11 (32KB) + AMSDOS in slot 7 - CPC+: OS_6128P loaded as system cartridge via cpr_load()

The standalone (non-libretro) version references external filenames cpc464.rom, cpc664.rom, cpc6128.rom, amsdos.rom in cap32/cap32.c:352-355 via config file loading (cap32/cap32.c:1831-1843), but the libretro port does not use this path. The libretro init (libretro/libretro-core.c:1509-1515) has a "TODO: future use to load custom bios" comment that is not implemented.

Keyboard layout patches are applied to the ROM in memory for French and Spanish layouts via rom_mods.h (cap32/cap32.c:1105-1129).

CP/M support loads a pre-built snapshot (cpm.h) into memory via snapshot_load_mem() in cap32/slots.c:90.

6 files | 1 required, 5 optional | 6 in repo, 0 missing

cpc464.rom required in repo standalone

cpc664.rom optional in repo standalone

cpc6128.rom optional in repo standalone

amsdos.rom optional in repo standalone

system.cpr optional in repo standalone

MF2.rom optional in repo standalone

Generated on 2026-09-14T09:03:09Z