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Drop a comment with your MAME version and the exact error text.
The official MAME Neo Geo BIOS is stored in a single zip file named . Inside, you need a specific set of ROM files. MAME is very picky about the exact names, sizes, and checksums. mame neogeo bios
🧠 The UniBIOS documentation (PDF) includes a detailed log of BIOS entry points, exception vectors, and region detection – a mini technical paper in itself. Drop a comment with your MAME version and
NeoGeo games in MAME use a parent/clone system. mame neogeo bios