Some games require a "Parent" ROM to be in the same folder as the "Clone" or the BIOS. Always keep your full BIOS pack in the main ROM directory.
Never unzip your BIOS files. MAME is designed to read the .zip archive directly. Simply move the zipped files into your designated ROMs folder. 2. Matching Versions Mame 0.139u1 Bios Pack
Use a tool like Clrmamepro to verify that your BIOS files match the 0.139u1 datfile. Some games require a "Parent" ROM to be
Needed for PolyGame Master titles like Knights of Valour . Mame 0.139u1 Bios Pack