The best controller for steam deck is one you already have. My PS One Analog is still working, tho through cable with more than a decade old PS2 to PS3 USB converter.
How to use a generic PC USB joypad on a PS2 - Quora
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Ps2 Controller Usb Pc Gamepad Get Gaming Experience! - Temu United Kingdom
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OSTENT USB Adapter Converter Cable Cord for Sony PS1 PS2 Wired Controller Gamepad Joystick to PC Laptop: Amazon.co.uk: PC & Video Games
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Mcbazel PlayStation 2 Controller to USB Adapter for PC or Playstation 3 Converter Cable for Sony DualShock PS2 PS3 Controllers (NOT compatible with Dancing Mat Guitar Hero): Amazon.co.uk: PC & Video Games
Is it possible to blend a usb wire to an old ps2 controller and use it in a computer? : r/electrical
