Either an EEPROM programmer if you have a blank flash chip OR a way to boot a burned CD-R/homebrew on your PS1 (FreePSXBoot, modchip, disc swap method) if you have an existing BIOS mod or flash chip pre-flashed with stock BIOS.Both of these require your system to have a 32-pin BIOS chip (see Supported Hardware section below for systems that potentially do not have a 32-pin chip).OR if you want to try lifting an individual TSOP pin you can try Will's Console Modifications in the UK for a board + flash chip with stock BIOS.Order your own boards from OSHPark and see flashing options below.A replacement EEPROM chip for your system's BIOS and an adapter board to match the console pinout.A supported original BIOS dump (.bin format).Users who wish to test these patches should have an easy way to modify their BIOS back to stock in case something goes wrong. WARNING- As of the time of publishing these patches have had limited testing on real hardware. The PS1Digital cannot send this acknowledgement ping back, so I'm unsure of how to properly send the entire message without a MemCard Pro involved (though I suspect it's possible since I believe a PS1Digital + XStation combo can do so). This is because of the way that the MemCard Pro acknowledges the Game ID commands being sent to it, pinging back data that lets the patched BIOS know to continue. If you have access to a PS1Digital and would like to test this feature, please let me know! As it stands, I expect that Game ID for PS1Digital would work correctly if you have a MemCard Pro inserted, but will likely NOT work with regular memory cards.

Unfortunately, I do not have one to test with or a working PS1 model that would support it anyways.

The PS1Digital can also utilize the Game ID data in order to automatically select video settings on a per-game basis. This doesn't require the user to boot any separate software or exploit, plays the nostalgic PS1 boot splash like a regular startup, and should hopefully maintain full software compatibility. Available in this repository are xdelta patches for PS1 BIOS files that will allow games running off of disc or PSIO to automatically send Game ID data to a MemCard Pro, allowing it to auto-select a virtual memory card page for each game you play.

Psx japan bios numbers