Last Updated: 5th March 2021
Psy-Q was an SDK created by SN Systems Limited and Psygnosis. The SDK came with manuals, documents, discs, floppies, a blue parallel dongle and a SCSI ISA interface (yellow) card for the comms link to the Playstation 1.
Later on, the SDK was ripped and dumped onto the Internet, where many enthusiasts created their own games and applications on the PlayStation.
It is is the official Sony SDK that game developers used to create their games.