iCode Uno Atari Joystick, Paddle, Driving, and Trackball USB Adapter, Plus Edition
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Quad Retro USB Adapter for Atari Joysticks – 4 Ports – Pro Edition
9 pin to USB Dual Atari Joystick, Paddle, and Driving Adapter by iCode, DB9 ports, Pro 2
Amazon.com: 9 pin to USB Dual Atari Joystick, Paddle, and Driving Adapter by iCode, DB9 Ports, Plus Edition : Video Games
Retronics USB Joystick Adapter and Other Coolness with V-USB | Code and Life
Classic Joystick to USB Adaptor : 5 Steps (with Pictures) - Instructables
USB Atari RetroPort - retroUSB
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Atari joystick port - Wikipedia
eBay: Adapter to connect two joysticks Atari 2600 the PC via USB (NEW Dual Port PC Computer USB Port Controller Adapter for ATARI 2600 JOYSTICK) - Skooter Blog
Amazon.com: Hyperkin "Trooper II" Premium Atari 2600 Style Wired USB Joystick Game Controller For PC/Mac/Raspberry Pi/Retro Pie/Linux : Video Games
Retro-Link Atari - Controller to PC USB Adapter - Dual Port - Newegg.com
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Atari 5200 Controller to USB Adapter - 2 Joystick Ports with LCD Screen | eBay