PSIO. Playing .iso files on the PlayStation One without a mod chip or disc. - Wololo.net
Playstation 1 (PS1, PSX) PSIO Install Service with Warranty | eBay
PSIO Re-Reviews | RetroRGB
PSIO+PSONE+CD - YouTube
Consoles Unleashed / Jo on Twitter: "Sony PlayStation SCPH-1002 PU-8 PSIO switchboard install. Just two trace cuts and keeps the full functionality of the console and disc drive for playing games from
psio | RetroRGB
Ps1 Psio - Etsy
PSIO - PS1 Flash Cartridge / MY LIFE IN GAMING - YouTube