Could the PS1 support RAM upgrades though it's expansion port? | ResetEra
What was the PS1's Parallel I/O port used for? - Arqade
Amazon.com: Game Shark Pro Version 3.0 for PlayStation 1 with PARALLEL PORT : Video Games
PlayStation models - Wikipedia
raphnet. - Playstation controller to parallel port adapter
What was the PS1's Parallel I/O port used for? - Arqade
Bought a second PS1 at a family store with the Parallel I/O port... whatever that does... : r/psx
Sony PlayStation | Parallel Port Device | - YouTube
Replacement Parallel I/O Port Flap Expansion Clip-In Cover For Sony PS1 Console | eBay
PlayStation models - Wikipedia
PlayStation Architecture | A Practical Analysis
PS1 Parallel Port Cover Replacement 3D Printed - Etsy
PlayStation SCPH-550X Parallel I/O Port Cover by Kirill S | Download free STL model | Printables.com
How to hook up connect original SONY PlayStation 1 PS1 to HDTV HDMI — Gametrog
raphnet. - Playstation controller to parallel port adapter
What was the parallel port used on older PS1s? - PlayStation
PS1 Parallel Port Cover Replacement 3D Printed - Etsy
PSIO (PlayStation Flash Cart) - Stone Age Gamer
PlayStation PSIO - SD Flash Drive for your PS1 - YouTube
PlayStation 1 UNIROM CARTRIDGE! PLAY BURNS/BACKUP USA/JAPANESE PS1 GAME CD'S! - Video Games | Facebook Marketplace | Facebook
PlayStation PS 1 one information specs versions — Gametrog
PS1Digital + PsNee + Fully Refurbished PS1 Console – Dragon's Hoard Gaming, LLC
Quick speculation on the PS1 Classic possible hidden feature (In the comments) : r/playstation
PS1 Official Console Parallel Port Cover Replacement Part – kasynparts
Original Playstation One PS1 Gameshark V2.1 Parallel Port Cartridge Interact | eBay
foone🏳️⚧️ on X: "There was also the PS Movie Card PSX-002. This version worked differently because of how later PS1 models dropped the parallel port. (from the 1997 SCPH-9000 revision on) It
PSIO - Playstation Input Output — Retro Modding
