The Neo Geo CD also requires a BIOS. While typical names are neocd.bin or neocd_z.rom , some frontends or custom builds have used bios-cd-j.bin for the Japanese Neo Geo CD BIOS (since Neo Geo CD was primarily popular in Japan).
PS1 BIOS files are usually named scph1001.bin , scph5500.bin , scph5502.bin , etc. However, some simplified emulator launchers might use bios-cd-u.bin to indicate the US PS1 BIOS. This is extremely rare.