System ROM: Difference between revisions
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== CD/CDZ BIOS == | == CD/CDZ BIOS == | ||
=== RAM locations === | |||
*$10FD80: ? | |||
*$10FD83: Nationality (JP:0, EN:1, EU:2, goes up to 6 ?) | |||
[[File:cd2_bios.jpg|right|thumb|SP1 BIOS ROM on a CDM3-2 board.]] | [[File:cd2_bios.jpg|right|thumb|SP1 BIOS ROM on a CDM3-2 board.]] | ||
1MiB chip that contains [[Z80]] and [[68k]] programs, PCM sound, and graphics which are copied to the corresponding [[DRAM|DRAMs]] at boot time. | |||
Graphic visualisation of a CDZ BIOS dump, with separated data blocks (larger size available):<br> | Graphic visualisation of a CDZ BIOS dump, with separated data blocks (larger size available):<br> | ||
Revision as of 23:33, 13 February 2011
BIOSes are ROMs containing the initial program executed by NeoGeo systems. They are present in all hardware types.
AES BIOS
128kB. NEO-EP0.
MVS BIOS
128kB. SP-S2. Different names according to nationality.
CD/CDZ BIOS
RAM locations
- $10FD80: ?
- $10FD83: Nationality (JP:0, EN:1, EU:2, goes up to 6 ?)
1MiB chip that contains Z80 and 68k programs, PCM sound, and graphics which are copied to the corresponding DRAMs at boot time.
Graphic visualisation of a CDZ BIOS dump, with separated data blocks (larger size available):
File:Cdzbiosgfx.png
