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# CrocoDS - RetroBIOS

Type | libretro
Classification | official_port
Source | https://github.com/libretro/libretro-crocods
Upstream | https://github.com/redbug26/crocods-core
Version | v1
Profiled | 2026-03-23
Cores | crocods
Systems | amstrad-cpc

Platform details

bios_mapping: - source_ref: crocods-core/vga.c:185-200, crocods-core/platform.c:1009-1020 - notes: All ROMs are embedded. InitMemCPC() copies cpc6128_bin and romdisc_bin

into ROMINF and ROMEXT arrays via memcpy. No filesystem lookup occurs. retro_set_environment() does not request system_directory.

    **embedded_roms:**
    - source_ref: crocods-core/cpc6128.bin.c, crocods-core/romdisc.bin.c
    - notes: 2 ROM sets embedded as C byte arrays:

cpc6128_bin (32KB) - CPC 6128 OS (lower 16KB) + BASIC 1.1 (upper 16KB) romdisc_bin (16KB) - AMSDOS disk controller ROM, mapped to slot 7

    **model_rom_map:**
    - source_ref: crocods-core/vga.c:189-192
    - notes: CPC 6128 only: OS in ROMINF, BASIC in ROMEXT[0], AMSDOS in ROMEXT[7]

emulator_patch_ROM() applies language patches to ROMINF after loading

Technical notes

CrocoDS is an Amstrad CPC 6128 emulator ported to libretro. Supports .dsk, .sna, and .kcr file formats.

All system ROMs are compiled directly into the core binary as C byte arrays. No external BIOS files are required.

Embedded ROMs (crocods-core/): - cpc6128.bin.c: cpc6128_bin[32768] - CPC 6128 OS (16KB) + BASIC 1.1 (16KB) - romdisc.bin.c: romdisc_bin[16384] - AMSDOS disk controller ROM (16KB)

ROM initialization in InitMemCPC() (crocods-core/vga.c:185-200): - ROMINF (lower ROM, 16KB): first half of cpc6128_bin (OS) - ROMEXT[0] (upper ROM slot 0, 16KB): second half of cpc6128_bin (BASIC) - ROMEXT[7] (upper ROM slot 7, 16KB): romdisc_bin (AMSDOS)

Called from HardResetCPC() (crocods-core/platform.c:1009-1020) using the extern byte arrays directly. No filesystem ROM loading exists in the libretro path.

A Multiface ROM loader exists (crocods-core/multiface.c:51-61) that reads LocRomMulti via fopen(), but InitMultiface() is never called from the libretro build or platform.c. Dead code in libretro context.

The core does not request retro_system_directory or declare any firmware entries in the .info file. need_fullpath is false.

Only the CPC 6128 model is emulated (no CPC 464/664 selection).

No BIOS or firmware files required. Generated on 2026-03-25T14:56:43Z