Oh, a couple notes. "8V" is used by Action Replay and such to produce +5V(usually with a regulator but some cheap clones use diode "hack" to achieve that instead). So while "3V"(usually 3.3V-3.5V but IIRC they call it "3V") is often used to power the EEPROM/fl...

How did you come to that conclusion? We had internal VCD carts for the PSone that actually boot without any modifications or a flash bios. Also, I and some others have successfully wired a flashrom and used that without issue. I traced out most (if not all) the testpoints for the BIOS, the link is ...

Necroposting to say that this won't work as-is on the PSOne. The BIOS prior to PSOne contains code that is responsible for executing the PIO port's ROM(the AR ROM). That's gone as of the PSOne. You'd need to replace the BIOS with flash and hack the PSOne ROM to add code for comparable entry points f...