HOW TO - Atari style joystick/controller to USB adapter - Make:
Retro Classic Controller Gamepad Joystick For Atari 2600 Console System Black - Joysticks - AliExpress
USB Joystick Converter for Atari, Amiga, Commodore 64 – Electronics Projects Circuits
USB Joystick Adapter from Retronic Design on Tindie
Homemade USB adapter for 9 pin Atari C64 Amiga Joysticks - YouTube
Converting the “Competition Pro Extra USB” to C64/Amiga/Atari DB9 – pagetable.com
USB Joystick Adapters – breadbox64.com
Retro 9 Pin Joystick to USB Converter : 4 Steps (with Pictures) - Instructables
Use Atari Paddles with Your PC - Gaming Hacks [Book]
raphnet. - Atari Jaguar controller to USB adapter
Atari joystick port - Wikipedia
Compatible List For Joysticks/Pads and Adapters | thec64community
Retronics USB Joystick Adapter and Other Coolness with V-USB | Code and Life
New Usb To 15 Pin Female Midi Joystick Game Port Adapter Nest Converter Rockfire 15-p Rm-203 Gameport 98/me/2000/xp Green *fd047 - Connectors - AliExpress
Retronics USB Joystick Adapter and Other Coolness with V-USB | Code and Life