Homemade USB adapter for 9 pin Atari C64 Amiga Joysticks - YouTube
RetroScalerUSB CD32 / Amiga / C= / Atari Joysticks to USB Adapter Game Controller Conveter Adapter For Game Consoles
USB Joystick Adapters – breadbox64.com
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
Commodore 64 Joystick USB Adapter | C64Joy - Hackster.io
USB Adapter For DB9 Joysticks Atari / Amiga / Commodore / MSX / SMS / emulators | eBay
The C64 Joystick Adapter
USB C64 Joystick adapter (for emulator) - Commodore Remix