DIY PSX to USB is A-OK! - Make

Adapter to use wired/wireless for PS1/PS2 controllers on your PC and for PS3. Support for PS3 console and PC. Double vibration feedback function.

VBESTLIFE PS1/PS2 to PS3 Controller Adapter, PS1/2 to USB Cable for PC, PS3, Win PC Wired/Wireless for PS1/PS2 Controllers

Raspberry Pi Pico Replaces PlayStation Memory Card

GC Pocket Adapter+ GameCube to USB-C Controller Adapter

Build a retro CD-ROM console — The MagPi magazine

Make Your Own PlayStation Classic

Playstation Classic DIY!

The History of The PlayStation Controller

Review: True Blue Mini for PS Classic - Hackinformer

8bitdo releases DIY Modkits for PS1 & PS1 Classic

Can I Hack A Playstation Classic? — HackSpace magazine

Make Your Own PlayStation Classic