Is it possible to make a bios mod, piggy backing, for the ps2 like in this picture for dc?
Here is a second chip soldered above of the original bios.
herben:The BIOS is "sort of" authorized.. 18k+(perhaps only v1+) use ROMVER from the BIOS to unlock the drive on startup. That's really only the tip of the iceberg when it comes to making a completely custom BIOS. Also, please don't ask me for specifics on this process as I don't want to piss off Sony.
That being said, I've used M29W320D(T/B) flash chips in PS2 and programmed a modified copy of the official BIOS to it...
Unfortunately it seems I don't have my notes from the BIOS pinout anymore.