Open a command prompt inside the MAME folder and run: mame -verifyroms

The MAME emulator, therefore, requires these BIOS files to accurately emulate the arcade machines. However, due to copyright and legal issues, MAME cannot officially distribute these BIOS files with its emulator. This is where third-party BIOS packs come into play, like the MAME 0.139u1 BIOS pack.

: The 0.139u1 BIOS pack will not work with modern MAME because: