Editing ROM

= Overview =
PS2 contains one or two Mask-ROMs, "BOOT ROM" containing the [[Bios|BIOS]] and "DVD ROM" containing the [[DVD Player]], with the latter being optional, since early PS2 consoles (SCPH-10000 and SCPH-15000, A-chassis) came with no DVD Player preinstalled. On these consoles, it had to be installed onto Memory Card from the [[Utility Disc]] bundled with the console. [[PSX]] also has no DVD Player in ROM; it's loaded from HDD instead. In many consoles containing a version of the DVD Player in ROM, it is physically located within the same ROM chip as the BIOS. Despite this, the DVD Player section of the ROM is electrically addressed independently and handled as a separate device by [[IOP/Deckard|IOP]]. Other consoles contain two physically separate ICs. Many fat and early slim motherboards have solder pads for both variants and can have these installed either way.

BOOT ROM always has a size of 32Mbit/4MByte, while DVD ROM has a size of 16Mbit/2MByte until G-chassis (thus until SCPH-39XXX) and 32Mbit/4MByte from H-chassis onwards (thus from SCPH-5XXXX).

Only in the special Chinese SCPH-50009, there is an additional third ROM(-partition), containing a Chinese font set.

''' The following sections are incomplete and work in progress! '''

= Numbering =
All BIOS and DVD ROMs have the version of the BIOS / DVD Player they store marked on the IC. In all consoles except A-chassis (SCPH-10000 and SCPH-15000), these versions are prefixed with a "B" for BIOS (e.g. B-20-030) or a "D" for DVD (e.g. D-221-030). On ROMs containing both, BIOS and DVD Player, both versions are printed separately on the IC. Instead of the dashes within the version numbers given in the examples, the writing can also have spaces, or no separator at all. 
=== Fat consoles ===
For the BIOS ROM, the first digit defines the region (e.g. 0 for Japan, 1 for North America, 2 for Europe). The second digit defines the console type (e.g. 0 for Retail, 1 for Dev). For the DVD Player ROM, it additionally also defines the DVD Region Code (and PAL capability?). 
The second group defines the actual version.

BIOS Examples:</br>
B-00-100: 0 = Japan, 0 = Retail, 100 = version (from a Japanese SCPH-10000 console)</br>
B-01-100: 0 = Japan, 1 = Dev, 100 = version (from a Japanese DTL-H10000 console)</br>
B-20-030: 2 = Europe, 0 = Retail,  030 = version (from a UK SCPH-35003 console)

'''Note: While Russian ROMs have the same BOOT ROM version labelled as their European counterparts, their actual content appears to be different. This is subject to further research.'''

DVD Examples:</br>
D-020-020: 0 = Japan, 2 = DVD region code 2, 0 = NTSC only?, 020 = version (from a Japanese SCPH-18000 console)</br>
D-341-110: 3 = Oceania, 4 = DVD region code 4, 1 = PAL and NTSC (however, region code must match)?, 110 = version (from an Australian SCPH-50002 console)</br>
D-552-111: 5 = Russia, 5 = DVD region code 5, 2 = ???, 111 = version (from a Russian SCPH-50008 console)

=== Slim consoles ===
On slim consoles, numbering has changed a lot, since these consoles have multi-region ROMs for both, BIOS and DVD Player, which are patched on-the-fly by [[MechaCon]] depending on it's regional settings from EEPROM.

= Known BOOT ROM versions =
== Fat consoles ==
=== Japan ===
* '''00-100'''
** BOOT ROM of early SCPH-10000 consoles (A-chassis, GH-001)
** Found in consoles manufactured until March 25th, 2000
** Is the only version that does not block launching the buggy DVD Player 1.00 from Memory Card, which allows a region code check bypass
** Contains the Protokernel, which lacks several features and has several differences to later versions, creating some issues with homebrew software
** Comes in a different package with a much larger footprint than all other ROMs except 00-100 and 00-101
* '''00-101'''
** BOOT ROM of later SCPH-10000 and and all SCPH-15000 consoles (A-chassis, GH-001 and GH-003)
** Found in SCPH-10000 consoles manufactured later on as well as in SCPH-15000 consoles
** Blocks launching DVD Player 1.00 from Memory Card
** Contains the Protokernel, which lacks several features and has several differences to later versions, creating some issues with homebrew software
** Comes in a different package with a much larger footprint than all other ROMs except 00-100 and 00-101
* '''B-00-012'''
** BOOT ROM of SCPH-18000 consoles (A+-chassis GH-003 and AB-chassis GH-008)
** On GH-003, the ROM IC is located on a daughter board due to GH-003 not having the correct footprint at the ROM-pads
** First japanese BIOS to run the final kernel instead of the Protokernel
** First japanese BIOS to be bundled with a DVD Player ROM
* '''B-00-040'''
** BOOT ROM of Japanese D-chassis consoles (SCPH-30000)
* '''B-00-120'''
** BOOT ROM of Japanese J-chassis consoles (SCPH-50000)
=== North America ===
* '''B-10-010'''
** BOOT ROM of North American B/B'-chassis launch consoles (SCPH-30001)
* '''B-10-040'''
** BOOT ROM of North American D-chassis consoles (SCPH-30001)
* '''B-10-050'''
** BOOT ROM of early North American F-chassis consoles (SCPH-30001R)
* '''B-10-060'''
** BOOT ROM of late North American F-chassis consoles (SCPH-30001R)
* '''B-10-070'''
** BOOT ROM of North American G-chassis consoles (SCPH-39001/39010)
* '''B-10-102'''
** BOOT ROM of North American H-chassis consoles (SCPH-50001/50010)

=== Europe ===
* '''B-20-020'''
** BOOT ROM of PAL-European C/C'-chassis launch consoles (SCPH-30003/4)
* '''B-20-030'''
** BOOT ROM of PAL-European D-chassis consoles (SCPH-30003/4, SCPH-35003/4)
* '''B-20-050'''
** BOOT ROM of early PAL-European F-chassis consoles (SCPH-30003/4R)
* '''B-20-060'''
** BOOT ROM of late PAL-European F-chassis consoles (SCPH-30003/4R)
* '''B-20-080'''
** BOOT ROM of PAL-European G-chassis consoles (SCPH-39003/4)
* '''B-20-101'''
** BOOT ROM of early PAL-European H-chassis consoles (SCPH-50003/4)
* '''B-20-103'''
** BOOT ROM of late PAL-European H-chassis and I-chassis consoles (SCPH-50003/4)

=== Asia ===
* '''B-60-103'''
** BOOT ROM of of Taiwanese H-chassis consoles (SCPH-50007, maybe also I-chassis? Maybe also Korea and Hongkong SCPH-50005 and SCPH-50006?)

== Slim consoles ==
* '''B1110A'''
** BOOT ROM of slim SCPH-70001/11/12 (North America) consoles
** ''Some'' regional variation is done through on-the-fly patching through MechaCon, determined by region parameters stored in it's EEPROM
* '''B2110A'''
** BOOT ROM of slim SCPH-70002/3/4/8 (all PAL SCPH-7000x) consoles
** ''Some'' regional variation is done through on-the-fly patching through MechaCon, determined by region parameters stored in it's EEPROM
* '''B3110A'''
** BOOT ROM of slim SCPH-70000 (Japan) consoles
** ''Some'' regional variation is done through on-the-fly patching through MechaCon, determined by region parameters stored in it's EEPROM
* '''B4110A'''
** BOOT ROM of SCPH-70005 (Korea) and SCPH-70007 (Taiwan) consoles
** Probably also used in SCPH-70006 (Hong Kong)
** ''Some'' regional variation is done through on-the-fly patching through MechaCon, determined by region parameters stored in it's EEPROM
* '''B6120B'''
** Universal BOOT ROM of SCPH-75XXX consoles
** ''All'' regional variation is done through on-the-fly patching through MechaCon, determined by region parameters stored in it's EEPROM
* '''B6130B'''
** Universal BOOT ROM of SCPH-77XXX consoles
** ''All'' regional variation is done through on-the-fly patching through MechaCon, determined by region parameters stored in it's EEPROM
* '''B6140B'''
** Universal BOOT ROM of SCPH-79XXX consoles and early SCPH-90XXX consoles
** ''All'' regional variation is done through on-the-fly patching through MechaCon, determined by region parameters stored in it's EEPROM
* '''B6150B'''
** Universal BOOT ROM of late SCPH-90XXX consoles
** ''All'' regional variation is done through on-the-fly patching through MechaCon, determined by region parameters stored in it's EEPROM
** Patches FMCB (Use Free DVD Boot instead)
* '''B6160B'''
** BOOT ROM for the PS2 motherboard inside the Bravia KDL-22PX300 TV
** Patches FMCB (Use Free DVD Boot instead)

== Dev consoles ==
* '''01-100'''
** BOOT ROM of early japanese DTL-H10000

= Known DVD ROM versions =
== Fat consoles ==
''Very incomplete''
=== Japan ===
*'''D-020-020'''
**DVD Player 2.00J
**DVD ROM of all japanese SCPH-18000 consoles (A+-chassis GH-003 and AB-chassis GH-008)
**On GH-003, the ROM IC is located on a daughter board due to GH-003 not having the correct footprint at the ROM-pads
**First DVD Player to support the IR remote control
*'''D-020-040'''
**DVD Player 2.??J
**DVD ROM of japanese D-chassis consoles (early? late?)
*'''D-020-120'''
**DVD Player 3.03J
**DVD ROM of japanese J-chassis SCPH-50000 consoles
=== North America ===
*'''D-110-010'''
**DVD Player 1.10U
**DVD ROM of US launch consoles, SCPH-30001 (B-chassis GH-004 and B'-chassis GH-005)
**The first ROM-based DVD player to be built into consumer PS2 consoles
*'''D-110-040'''
**DVD Player 2.10U
**DVD ROM of North American F-chassis SCPH-30001R consoles
*'''D-110-110'''
**DVD Player 3.00U
**DVD ROM of North American H-chassis SCPH-50001 consoles

=== Europe ===
*'''D-221-020'''
**DVD Player 1.20E
**DVD ROM of european launch consoles, SCPH-30003/SCPH-30004
*'''D-221-030'''
**DVD Player 1.30E
**DVD ROM of early european D-chassis SCPH-30003/4 consoles (no R behind the model number)
*'''D-221-060'''
**DVD Player 2.13E
**DVD ROM of european G-chassis SCPH-39003/4 consoles
*'''D-221-110'''
**DVD Player 3.00E
**DVD ROM of european H-chassis SCPH-50003/4 consoles
*'''D-221-111'''
**DVD Player 3.02E
**DVD ROM of european I-chassis SCPH-50003/4 consoles

=== Oceania ===
*'''D-341-110'''
**DVD Player 3.??A
**DVD ROM of Australian (H? I?)-chassis SCPH-50002 consoles
=== Russia ===
*'''D-552-111'''
**DVD Player 3.02D
**DVD ROM of russian H-chassis consoles (SCPH-50008)

== Slim consoles ==
*'''D1010U'''
** Universal DVD ROM used in all SCPH-70XXX K-chassis slim consoles from all regions
** DVD Player 3.10x
** Regional variation is done through on-the-fly patching by MechaCon, determined by region parameters stored in it's EEPROM
*'''D0020U'''
** Universal DVD ROM used in all slim consoles (and the Bravia KDL-22PX300 TV) from all regions, except K-chassis SCPH-70XXX
** DVD Player 3.11x
** Regional variation is done through on-the-fly patching by MechaCon, determined by region parameters stored in it's EEPROM