System ROM: Difference between revisions

Revision as of 08:23, 6 April 2012

(Enlarge) Configuration and book keeping menus in the SP-2 MVS BIOS

BIOSes (officially called "SYSTEM ROM") are ROMs containing the 68k startup program and various generic functions for NeoGeo systems. They are present in all hardware types in various versions. The NeoGeo CD BIOSes also contain graphics, sound, and Z80 code.

The official BIOSes have their nationality set by the byte at address $C00401 (0=Japan, 1=US, 2=Euro). The type is set by the byte at $C00400 (0=AES, $80=MVS).

AES BIOS

Size: 128KiB. Called "NEO-EP0".

MVS BIOS

Size: 128KiB. Called "SP-S2", "SP-E"... Different names according to nationality.

Graphic visualisation of sp-s2.bin:

binviewsp2.png

CD/CDZ BIOS

File:Cd2 bios.jpg

SP1 BIOS ROM on a CDM3-2 board.

File:Brd spj.jpg

SPJ Japanese BIOS on a ROM-only arcade board. Picture courtesy of [MVS-Scans].

Size: 512KiB.

Chip that contains Z80 and 68k programs, PCM sound, and graphics which are copied to the corresponding DRAMs at boot time. 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

UniBIOS

Hacked MVS BIOS with various added functionalities such as cheats, CRC calculation, jukebox, error handling. See Universe BIOS.

Neopen BIOS

Opensource AES/MVS BIOS in development. See Neopen BIOS.

@@ 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.
+[[File:biosmenus.png|thumb|(Enlarge) Configuration and book keeping menus in the SP-2 MVS BIOS]]
-The official BIOSes have their nationality set by the byte at address $C00401 (0=Japan, 1=US, 2=Euro). The Type is set by the byte at $C00400 (0=AES, $80=MVS).
-[[File:biosmenus.png|thumb|(Enlarge) Configuration and book keeping menus in the SP-2 MVS BIOS]]
+BIOSes (officially called "SYSTEM ROM") are ROMs containing the [[68k boot process|68k startup program]] and various generic functions for NeoGeo systems. They are present in all hardware types in various versions. The NeoGeo CD BIOSes also contain graphics, sound, and [[Z80]] code.
-Cart BIOSes have their nationality byte at address $401 ($C00401).
+The official BIOSes have their nationality set by the byte at address $C00401 (0=Japan, 1=US, 2=Euro). The type is set by the byte at $C00400 (0=AES, $80=MVS).
 == AES BIOS ==
-[[File:aes_biosep0.jpg|right|thumb|Toshiba EP0 BIOS ROM found on an AES board]]
 Size: 128KiB. Called "NEO-EP0".
+[[File:aes_biosep0.jpg|300px]]
 == MVS BIOS ==
@@ Line 16: / Line 15: @@
 [[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", "SP-E"... Different names according to nationality.
@@ Line 21: / Line 21: @@
 [[File:binviewsp2.png|binviewsp2.png]]
-== UniBIOS ==
-See [[Universe BIOS]].
 == CD/CDZ BIOS ==
@@ Line 33: / Line 29: @@
 Size: 512KiB.
-Chip that contains [[Z80]] and [[68k]] programs, PCM sound, and graphics which are copied to the corresponding [[DRAM|DRAMs]] at boot time. The BIOS on CD systems also contains graphics and sounds. There is ''no'' [[SFIX]] or [[SM1]] ROMs on cart systems.
+Chip that contains [[Z80]] and [[68k]] programs, PCM sound, and graphics which are copied to the corresponding [[DRAM|DRAMs]] at boot time. There is ''no'' [[SFIX]] or [[SM1]] ROMs on cart systems.
 The [[CD hardware versions|CD1 and CD2]] BIOSes (FRONT-SP1 and TOP-SP1) include the [[Sound drivers list|"Ver 3.0 by Mr.Noric.1993/11/10 14:00"]] Z80 [[sound driver]].
@@ Line 55: / Line 51: @@
 Graphic visualisation of a CDZ BIOS dump, with separated data blocks:<br>
 [[File:cdzbiosgfx.png]]
+== UniBIOS ==
+Hacked MVS BIOS with various added functionalities such as cheats, CRC calculation, jukebox, [[68k exception handling|error handling]]. See [[Universe BIOS]].
+== Neopen BIOS ==
+Opensource AES/MVS BIOS in development. See [[Neopen BIOS]].
 [[Category:Base system]]