Winterground Fairlands - A World Of Funmagineering!: Retro Challenge 2015/7 - Amiga Mouse, Joystick, Keyboard USB interface
Atari joystick port - Wikipedia
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
9pin Joystick Controller Cable for Atari 2600 Commodore C64 Vic-20 Ami – RetroArcadeCrafts