System ROM: Difference between revisions
mNo edit summary |
mNo edit summary |
||
| Line 1: | Line 1: | ||
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. | 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. | ||
The MVS BIOS nationality is set by the byte at address $C00401 (0=Japan, 1=US, 2=Euro). | |||
[[File:biosmenus.png|thumb|(Enlarge) Configuration and book keeping menus in the SP-2 MVS BIOS]] | [[File:biosmenus.png|thumb|(Enlarge) Configuration and book keeping menus in the SP-2 MVS BIOS]] | ||
Revision as of 00:37, 9 November 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.
The MVS BIOS nationality is set by the byte at address $C00401 (0=Japan, 1=US, 2=Euro).
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
