System ROM

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Toshiba EP0 BIOS ROM found on an AES board

BIOSes are ROMs containing the initial program executed by NeoGeo systems. They are present in all hardware types.

Toshiba SP-S2 BIOS ROM on a 1FZS MVS slot.

AES BIOS

128kB. NEO-EP0.

MVS BIOS

128kB. SP-S2. Different names according to nationality.

CD/CDZ BIOS

File:Cd2 bios.jpg
SP1 BIOS ROM on a CDM3-2 board.

512kB (1MB ?). One chip that contains Z80 and 68k programs, PCM sound, and graphics data which are copied to the corresponding DRAMs at boot time.

File:Brd spj.jpg
SPJ Japanese BIOS on a ROM-only arcade board. Picture courtesy of [MVS-Scans].