Most arcade games in MAME do not require a separate BIOS, but those that run on shared hardware systems do. Some common BIOS files include:
Without these files, the emulator cannot "boot" the virtual hardware. While some games are self-contained, many famous titles—especially those from major manufacturers like Neo-Geo or Capcom—share a common set of startup instructions. Essential BIOS Files for Arcade Emulation mame32 bios
A new tab within the main MAME32 interface titled : Most arcade games in MAME do not require
: In MAME32, you can verify if your BIOS files are recognized by clicking File > Audit All on the toolbar. Troubleshooting Placing Bios's in folder MAME? | The Emulator Zone Forum mame32 bios