The NeoGeo 4.0 UNI-BIOS for MVS / AES is free http://unibios.free.fr/download.html
I saw this a few days ago. Is it ideal to use this over a standard Neo Geo bios for things like FBA?
I just added it to the neogeo.zip file, renamed it to "uni-bios_4_0.rom" and then copied the "neogeo.zip" in to another folder and replaced the original "uni-bios.rom" with the 4.0 "uni-bios.rom"version.
Not really tested it yet so not sure how it wirks in FBA, Mame GeNeo etc
Dingoo A320, GCW0, RS-97 x2, Revo-K101, RS-90, PSP, GameGadget, New 3DS 128GB, PS Vita 200GB, RS-45, Gamebox Advance and a few other obscure devices