System ROM: Difference between revisions
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[[File:mvs_sp-s2.jpg|right|thumb|Toshiba SP-S2 BIOS ROM on a 1FZS MVS slot.]] | [[File:mvs_sp-s2.jpg|right|thumb|Toshiba SP-S2 BIOS ROM on a 1FZS MVS slot.]] | ||
[[File:mvs_sp1v2.jpg|right|thumb]] | |||
Size: 128KiB. Called "SP-S2". Different names according to nationality. | Size: 128KiB. Called "SP-S2". Different names according to nationality. | ||
Revision as of 15:37, 26 October 2011
BIOSes (officially called "SYSTEM ROM") are ROMs containing various generic functions and the startup program for NeoGeo systems. They are present in all hardware types.
AES BIOS
Size: 128KiB. Called "NEO-EP0".
MVS BIOS
Size: 128KiB. Called "SP-S2". Different names according to nationality.
Holds functions for coins, calendar and player starts.
CD/CDZ BIOS
Size: 512KiB.
Chip that contains Z80 and 68k programs, PCM sound, and graphics which are copied to the corresponding DRAMs at boot time. The BIOS on CD systems also contains graphics and sounds. There is no SFIX or SM1 ROMs on cart systems.
The CD1 and CD2 BIOSes (FRONT-SP1 and TOP-SP1) include the "Ver 3.0 by Mr.Noric.1993/11/10 14:00" Z80 sound driver.
The CDZ BIOS includes the "Ver 3.0 by MAKOTO.04/03/10 to SK" driver.
The NeoGeo CD (not CDZ) BIOS contains credits, organized to be displayed on the fix layer (how can this be seen on screen ?):
CREDITS SOFTWARE NORIYUKI HIGASHI HARDWARE MOTOO YOKOYAMA TOSHIYA YAHARA GRAPHICS OTIAI SPECIAL JON GUSO THANKS CURRY SHIMIZU SNK ALL STAFF
Noriyuki Higashi = Mr.Noric
Graphic visualisation of a CDZ BIOS dump, with separated data blocks:
File:Cdzbiosgfx.png
