Here’s a complete guide to understanding and using the with RetroArch .
Place these files in RetroArch’s system folder (usually retroarch/system/ ).
The Sega Saturn BIOS (Basic Input/Output System) acts as the console's "brain." It handles the initial boot sequence, the iconic 3D logo animation, and the internal language settings.
The Sega Saturn BIOS contains critical code that allows the console to function, and it's required to run games on RetroArch. Without a Sega Saturn BIOS, you won't be able to play Saturn games on RetroArch. The BIOS is responsible for:
Setting up the Sega Saturn can be tricky because it is notoriously picky about BIOS files. To get games running, you must have the correct files named exactly as the emulator expects.
retroarch/system/sega_101.bin, mpr-17933.bin, mpr-18811-mx.rom