Thus, a refers to a collection of BIOS files that are specifically compatible with MAME version 0.139u1.

Unlike many other emulators where BIOS files go in a separate "system" folder, MAME generally requires these files to remain in the main folder.

The is a essential collection of system software files (BIOS) required to run specific arcade hardware emulated by MAME 0.139u1 and MAME4droid (0.139u1) . Unlike standard game ROMs, BIOS files contain the "operating system" data of the original arcade cabinets, such as the Neo Geo or Namco systems. Why a BIOS Pack is Necessary