GitHub - tebl/C64-Joystick-Adapter: A simple device that allows the connection of two Commodore 64 joysticks to a modern computer over USB (using an Arduino Pro Micro). The overall goal is to be
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
UPDATE] Converting the “Competition Pro Extra USB” to C64/Amiga/Atari DB9 – pagetable.com
TheC64 Micro Switch Joystick
C64 USB Joystick Adapter
Competition Pro USB Joystick + '99 Best of C64 Classix®' Games Collection, Jöllenbeck GmbH, Press release - PresseBox