USBJoy2.0 - adapter. Connect your Atari Amiga C64 joystick to PC! Develop your own usb device! - Polish electronics for 3D printers, CNC, robotics, retro computers
Joystick Maintenance – breadbox64.com
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C64 Joystick Adapter | Hackaday
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Ultimate fix for the C64 Mini Joystick - Use any Atari or C64 Original joystick! - YouTube