Retro 9 Pin Joystick to USB Converter : 4 Steps (with Pictures) - Instructables
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Atari – Kempston Joystick Pinout diagram. – JamBlog!
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Retro Isle - Spectrum Joysticks
Controller Conversion Help - Atari Jaguar - AtariAge Forums
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A Keypad Joypad For Your Retro Gaming | Hackaday
USB joystick adapter for 9 pin joysticks – Vintage is The New Old
Joystick Controller for Commodore - Commodore 64 Brain
General Purpose port - MSX Wiki
Reviving an old joystick with an Arduino Leonardo | It's Every Bit For Itself
Amazon.com: JoFong Classic Retro Controller, Suitable for AV 620, HD 621 HD 821 Classic Game Consoles Plug-and-Play Wired Video Gamepad-9 Pin Plug 2 Packs,620-621 Controller : Toys & Games
Vectrex Controller to Atari 2600 Adapter - CNK
Joystick - DenialWIKI
Joystick information and circuits
