Amazon.com: Retro USB Adapter for Atari Joysticks and Paddles - 4 Port/Players : Electronics
USB Joystick Adapters – breadbox64.com
Compatible List For Joysticks/Pads and Adapters | thec64community
USB Joystick Adapters – breadbox64.com
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
C64 USB Joystick Adapter
USB Joystick Adapters – breadbox64.com
USB Joystick Adapter from Retronic Design on Tindie