Quick speculation on the PS1 Classic possible hidden feature (In the comments) : r/playstation
Could the PS1 support RAM upgrades though it's expansion port? | ResetEra
iFixit Progressive Web App
PSIO (PlayStation Flash Cart) - Stone Age Gamer
Replacement Parallel I/O Port Flap Expansion Clip-In Cover For Sony PS1 Console | eBay
PlayStation Architecture | A Practical Analysis
Original Playstation One PS1 Gameshark V2.1 Parallel Port Cartridge Interact | eBay
USA Parallel Port I/O IO Slot Cover for PlayStation 1 PSX PS1 OEM SCPH 1001 5501 | eBay
PlayStation PSIO - SD Flash Drive for your PS1 - YouTube
PSIO - Playstation Input Output — Retro Modding
PS1 Official Console Parallel Port Cover Replacement Part – kasynparts
PS1 Parallel Port Cover Replacement 3D Printed - Etsy
raphnet. - Playstation controller to parallel port adapter
PlayStation 1 reset mod | Nicolas Electronics
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
What was the PS1's Parallel I/O port used for? - Arqade
PlayStation models - Wikipedia
How to hook up connect original SONY PlayStation 1 PS1 to HDTV HDMI — Gametrog
Amazon.com: Game Shark Pro Version 3.0 for PlayStation 1 with PARALLEL PORT : Video Games
raphnet. - Playstation controller to parallel port adapter
PS1Digital + PsNee + Fully Refurbished PS1 Console – Dragon's Hoard Gaming, LLC
Buy PS1 Replacement Part: Official Playstation Console Parallel Port Cover Playstation Australia
PlayStation PS 1 one information specs versions — Gametrog
Sony PlayStation PS1 Console
PlayStation models - Wikipedia
