fMSX - RetroBIOS¶


Type	libretro
Classification	Community forks
Source	https://github.com/libretro/fmsx-libretro
Upstream	https://fms.komkon.org/fMSX/
Version	6.0
Profiled	2026-03-23
Cores	fmsx
Systems	msx, msx2, msx2plus

Technical notes

Place all ROM files directly in the RetroArch system directory. No subdirectory needed. The core does chdir() to system_dir before loading.

The default model is MSX2+, which needs MSX2P.ROM and MSX2PEXT.ROM. If you only play cartridge ROMs, these two files are sufficient. For disk games (.dsk), also add DISK.ROM and enable "Simulate DiskROM" in core options.

KANJI.ROM and FMPAC.ROM are loaded automatically when present, no option needed.

22 files | 5 required, 17 optional | 21 in repo, 1 missing

MSX.ROM required in repo bundled

System: msx
Size: 32.0 KB
SHA1: 409e82adac40...
MD5: aa95aea2563c...
Source: fMSX/ROMs/MSX.ROM
Platforms: batocera, lakka, recalbox, retroarch, retrobat, retrodeck, retropie, romm
MSX1 main BIOS (32 KB). Loaded for MSX1 model (fMSX/MSX.c:693).

MSX2.ROM required in repo bundled

System: msx2
Size: 32.0 KB
SHA1: 6103b39f1e38...
MD5: ec3a01c91f24...
Source: fMSX/ROMs/MSX2.ROM
Platforms: batocera, lakka, recalbox, retroarch, retrobat, retrodeck, retropie, romm
MSX2 main BIOS (32 KB). Loaded for MSX2 model (fMSX/MSX.c:709).

MSX2EXT.ROM required in repo bundled

System: msx2
Size: 16.0 KB
SHA1: 5c1f9c7fb655...
MD5: 2183c2aff17c...
Source: fMSX/ROMs/MSX2EXT.ROM
Platforms: batocera, lakka, recalbox, retroarch, retrobat, retrodeck, retropie, romm
MSX2 extension BIOS (16 KB). Loaded alongside MSX2.ROM (fMSX/MSX.c:710).

MSX2P.ROM required in repo bundled

System: msx2plus
Size: 32.0 KB
SHA1: e2fbd56e42da...
MD5: 6d8c0ca64e72...
Source: fMSX/ROMs/MSX2P.ROM
Platforms: lakka, recalbox, retroarch, retrobat, retrodeck, retropie, romm
MSX2+ main BIOS (32 KB). Loaded for MSX2+ model, the default (fMSX/MSX.c:731).

MSX2PEXT.ROM required in repo bundled

System: msx2plus
Size: 16.0 KB
SHA1: fe0254cbfc11...
MD5: 7c8243c71d8f...
Source: fMSX/ROMs/MSX2PEXT.ROM
Platforms: lakka, recalbox, retroarch, retrobat, retrodeck, retropie, romm
MSX2+ extension BIOS (16 KB). Loaded alongside MSX2P.ROM (fMSX/MSX.c:732).

DISK.ROM optional in repo bundled

Size: 16.0 KB
SHA1: 032cb1c1c75b...
MD5: 80dcd1ad1a4c...
Source: fMSX/ROMs/DISK.ROM
Platforms: lakka, recalbox, retroarch, retrobat, retrodeck, retropie, romm
Disk controller BIOS (16 KB). Needed for .dsk content. Enable 'Simulate DiskROM' option (fMSX/MSX.c:780).

FMPAC.ROM optional in repo bundled

Size: 64.0 KB
SHA1: 9d789166e3ca...
MD5: 6f69cc8b5ed7...
Source: fMSX/ROMs/FMPAC.ROM
Platforms: lakka, recalbox, retroarch, retrobat, retrodeck, retropie, romm
FM-PAC cartridge ROM (64 KB, YM2413 FM synthesis). Auto-loaded into first free slot (fMSX/MSX.c:557).

KANJI.ROM optional in repo bundled

Size: 128.0 KB
SHA1: 84a645becec0...
MD5: febe8782b466...
Source: fMSX/ROMs/KANJI.ROM
Platforms: lakka, recalbox, retroarch, retrobat, retrodeck, retropie, romm
Kanji font ROM (128 KB). Auto-loaded if present, no option needed (fMSX/MSX.c:530).

MSXDOS2.ROM optional in repo bundled

Size: 64.0 KB
SHA1: c36c9e0f9673...
MD5: 6418d091cd69...
Source: fMSX/ROMs/MSXDOS2.ROM
Platforms: lakka, recalbox, retroarch, retrobat, retrodeck, retropie, romm
MSX-DOS 2 ROM (64 KB). Loaded when 'fmsx_dos2' option enabled and model is MSX2 or MSX2+ (fMSX/MSX.c:545).

PAINTER.ROM optional in repo bundled

Size: 64.0 KB
SHA1: 7fd2a28c4fda...
MD5: 403cdea1cbd2...
Source: fMSX/ROMs/PAINTER.ROM
Platforms: lakka, recalbox, retroarch, retrobat, retrodeck, retropie, romm
Paint utility ROM (64 KB). Auto-loaded for MSX2 and MSX2+ models (fMSX/MSX.c:552).

RS232.ROM optional in repo bundled

Size: 16.2 KB
SHA1: 7aec0134ad6a...
MD5: 279efd1eae0d...
Source: fMSX/ROMs/RS232.ROM
Platforms: lakka, recalbox, retroarch, retrodeck, retropie, romm
RS-232C serial interface ROM (16 KB + 256 B). Loaded into slot 3:3 (fMSX/MSX.c:533).

GMASTER2.ROM optional in repo

Konami GameMaster2 cartridge ROM. Loaded when 'fmsx_game_master' option enabled (fMSX/MSX.c:576).

GMASTER.ROM optional in repo

Konami GameMaster cartridge ROM. Fallback if GMASTER2.ROM is missing (fMSX/MSX.c:580).

CMOS.ROM optional in repo

RTC/CMOS settings. Auto-saved by the core on exit, auto-loaded on start (fMSX/MSX.c:526).

DEFAULT.FNT optional in repo bundled

MD5: 85b38e4128bb...
Source: fMSX/ROMs/DEFAULT.FNT, libretro.c:1546
Platforms: retrodeck
Default text font. Loaded by LoadFNT() (fMSX/MSX.c:523). Same content as CYRILLIC.FNT.

ITALIC.FNT optional in repo bundled

MD5: c83e50e9f33b...
Source: fMSX/ROMs/ITALIC.FNT, libretro.c:1546
Platforms: lakka, recalbox, retroarch, retrodeck, retropie, romm
Italic text font.

INTERNAT.FNT optional in repo bundled

MD5: ac4f4a90c1b1...
Source: fMSX/ROMs/INTERNAT.FNT, libretro.c:1546
Platforms: retrodeck
International text font.

CYRILLIC.FNT optional in repo bundled

MD5: 85b38e4128bb...
Source: fMSX/ROMs/CYRILLIC.FNT, libretro.c:1546
Platforms: lakka, recalbox, retroarch, retrodeck, retropie, romm
Cyrillic text font. Same content as DEFAULT.FNT.

KOREAN.FNT optional in repo south-korea bundled

MD5: 73291e76638a...
Source: fMSX/ROMs/KOREAN.FNT, libretro.c:1546
Platforms: retrodeck
Korean text font.

JAPANESE.FNT optional in repo japan bundled

MD5: aa28f0703b95...
Source: fMSX/ROMs/JAPANESE.FNT, libretro.c:1546
Platforms: retrodeck
Japanese text font.

CARTS.CRC optional missing

CRC database for cartridge identification and mapper detection. Tried first, before CARTS.SHA (fMSX/MSX.c:2697).

CARTS.SHA optional in repo bundled

MD5: 74b0f217fa0e...
Source: fMSX/ROMs/CARTS.SHA
Platforms: lakka, recalbox, retroarch, retrodeck, retropie, romm
SHA1 database for cartridge identification and mapper detection. Fallback when CARTS.CRC absent (fMSX/MSX.c:2712).

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