http://psio.com.au/
Sounds very cool. Old PS1's are plug and play, but the PS One units would need soldering. They have no Parallel port.PSIO is a cartridge that plug's into the back of your PlayStation 1 console, which will let you play your backed up PlayStation 1 games from an SD card.
It will also allow you to boot and run code you have programmed from an SD card on the actual PlayStation 1 console itself, making it a must have tool for homebrewers, developers and most importantly, gamers.