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With the PSIO add-on for the Playstation 1 you can load games from an SD-Card. It also supports CDDA and XA audio channels and most of the classic games are supported (list). To use this add-on you have to solder a switchboard on the mainboard that will automatically switch between the disc drive and the parallel port.

Here are some images that shows the installation of the PSIO switchboard:

posted by reachC  -  7. January 2017