CPS1 arcade boards did not require a separate BIOS file for most games because the game program ROM contained the system routines. However, some QSound games (e.g., Captain Commando , The Punisher , Cadillacs and Dinosaurs ) need a CPS1 QSound BIOS (ROM: cps1_qsound.rom or cps1.rom ). 2. Required BIOS Files (per MAME) For MAME (current versions), place these in the roms/ folder or mame/bios/ :