Converting the “Competition Pro Extra USB” to C64/Amiga/Atari DB9 – pagetable.com
Favorite C64 Joystick: Suncom TAC-2 "Totally Accurate Controller" : r/c64
The+C64+Micro+Switch+Joystick+Electronic+Games for sale online | eBay
USBJoy2.0E adapter - Extended Version. Connect your Atari Amiga C64 joystick to PC! Develop your own usb device! - Polish electronics for 3D printers, CNC, robotics, retro computers
3D-Printing a Joystick and a Paddle Controller (While Waiting on my C64 Parts)—Sven Krasser's Blog
Retro a javából! Itt a Comodore 64 - Tech2.hu
C64 USB Joystick Adapter
USB Joystick Adapters – breadbox64.com
Joystick - C64-Wiki
Dual 9 Way Atari/Commodore USB Joystick Adaptor
The C64 Micro Switch Joystick - Clear (Electronic Games) : Amazon.com.au: Video Games
C64 Joystick Adapter - Share Project - PCBWay
The C64 Joystick (Electronic Games) : Amazon.co.uk: PC & Video Games
Connect USB Joystick to Commodore C64 - Hackster.io
USB C64 Joystick adapter (for emulator) - Commodore Remix