Bios-cd-u.bin Bios-cd-e.bin Bios-cd-j.bin

These files appear in:

RetroArch expects the files to be named bios_CD_U.bin , bios_CD_E.bin , and bios_CD_J.bin inside the system folder. It does not automatically recognize the hyphenated version ( bios-cd-u.bin ). bios-cd-u.bin bios-cd-e.bin bios-cd-j.bin

The Sega CD was a region-locked device. A cartridge from one region often would not work on a unit from another. Consequently, Sega produced different internal firmware for different markets. These files appear in: RetroArch expects the files