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What BIOS versions exist?
What BIOS versions exist? –
This is probably kind of an esoteric question, but what BIOS revisions exist for PS2? I notice that some boards with different "v" designations in the scene appear to have the same BIOS code, or at least close enough that modchips didn't need to specifically add support for them. So what's floating around out there? Also, does the main BIOS package contain anything specific to the drive optics (on a stacked EEPROM or similar), or is that all stored in a separate package somewhere?
well, the PS2 is not an xbox or PSP, so theres no bios or firmware revisions, only board revisions which require different code in the modchips to put the right stuff in the right place to bypass CD/DVD checks. I am under the understanding that the console has basically one bios for all revisions. I am not sure about the slimline consoles and the fatboys as there was a radical board change there. Someone with more knowledge can correct this, but in regards to your question there's no BIOS specifically available for a specific console version, just firmwares for chips that impliment more support and features into an already designed chip.
I think that the drive optics are all controlled completely by the console and just have a few bus patches applied when needed so the console verifys the disc as authentic and proceeds with loading the data. Again, I am not a chip designer and I do now know all the features of the chip, or how it really interfaces but I don't think it adjusts anything in the PS2 bios which remains in -tact on the console.
As far as I know, all no-swap modchips patch the BIOS, and what causes those chips not to work in some PS2 versions is unsupported BIOS revisions. For example to the best of my knowledge nobody needed to add "V12A support" or "V13 support" because those boards use the same BIOS revision as V12, while none of them work in V14 (which incidentally also breaks a bunch of games) without an update...
I don't think it adjusts anything in the PS2 bios which remains in -tact on the console.