Some libretro cores require a BIOS to work.

BIOSes must be placed in the system folder although there are certain exceptions described in the table below.

BIOS requirements table

This table shows the required BIOS for each system. You’ll find up-to-date information here and here

System BIOS MD5 Comment
3DO - 3DO panafz10.bin 51f2f43ae2f3508a14d9f56597e2d3ce  
Atari - 7800 7800 BIOS (U).rom 0763f1ffb006ddbe32e52d497ee848ae  
Atari - Lynx lynxboot.img FCD403DB69F54290B51035D82F835E7B  
Final Burn Alpha     BIOS goes next to the ROMs
DOOM prboom.wad   BIOS goes next to the ROMs
Magnavox - Odyssey2 o2rom.bin 562d5ebf9e030a40d6fabfc2f33139fd  
MAME 2003     BIOS goes next to the ROMs
NEC - PC Engine - TurboGrafx 16 syscard3.pce 0754f903b52e3b3342202bdafb13efa5  
NEC - PC-FX pcfx.rom 08e36edbea28a017f79f8d4f7ff9b6d7  
Nintendo - Famicom Disk System disksys.rom ca30b50f880eb660a320674ed365ef7a  
Nintendo - Game Boy Advance gba_bios.bin a860e8c0b6d573d191e4ec7db1b1e4f6  
Phillips - Videopac+ o2rom.bin?   Same as Magnavox Oddessy2?
Sega - Dreamcast (reicast) dc_boot.bin e10c53c2f8b90bab96ead2d368858623 Goes under system/dc/
Sega - Dreamcast (reicast) dc_flash.bin 0a93f7940c455905bea6e392dfde92a4 Goes under system/dc/
Sega - Dreamcast (redream) boot.bin e10c53c2f8b90bab96ead2d368858623 Goes under system/dc/
Sega - Dreamcast (redream) flash.bin 0a93f7940c455905bea6e392dfde92a4 Goes under system/dc/
Sega - Mega Drive - Genesis bios_CD_J.bin 278a9397d192149e84e820ac621a8edd Japan
Sega - Mega Drive - Genesis bios_CD_U.bin 2efd74e3232ff260e371b99f84024f7f USA
Sega - Mega Drive - Genesis bios_CD_E.bin e66fa1dc5820d254611fdcdba0662372 Europe
Sega - Saturn (Yabause) saturn_bios.bin f273555d7d91e8a5a6bfd9bcf066331c  
Sega - Saturn (beetle-saturn) sega_101.bin 85ec9ca47d8f6807718151cbcca8b964 Japan
Sega - Saturn (beetle-saturn) mpr-17933.bin 3240872c70984b6cbfda1586cab68dbe USA/Europe
Sega - Saturn (beetle-saturn) mpr-18811-mx.ic1 255113ba943c92a54facd25a10fd780c ROM for King of Fighters ‘95
Sega - Saturn (beetle-saturn) mpr-19367-mx.ic1 1cd19988d1d72a3e7caa0b73234c96b4 ROM for Ultraman: Hikari no Kyojin Densetsu
Sharp - X68000 cgrom.dat cb0a5cfcf7247a7eab74bb2716260269 Goes under system/keropi/
Sharp - X68000 iplrom.dat 7fd4caabac1d9169e289f0f7bbf71d8e Goes under system/keropi/
Sony - PlayStation scph5500.bin 8dd7d5296a650fac7319bce665a6a53c Japan
Sony - PlayStation scph5501.bin 490f666e1afb15b7362b406ed1cea246 USA (Can be renamed from scph7003.bin)
Sony - PlayStation scph5502.bin 32736f17079d0b2b7024407c39bd3050 Europe
Sony - PlayStation Portable ppge_atlas.zim a93fc411c1ce7d001a2a812643c70085 Goes under system/PPSSPP/