| File name | Description | |-------------|------------------------------| | vs-bios.rom | Universal BIOS (most common)| | sp-s2.sp1 | Older system BIOS | | sp1-j3.bin | Japan BIOS | | sp1-u2.bin | USA BIOS | | sp1-e3.bin | Europe BIOS | | uni-bios_4_0.rom | Unibios (optional, popular) | | neo-epo.bin | Neo Geo EEPROM | | neo-po.bin | Protection data | | neo-dbg.bin | Debug BIOS |