Duo Retro USB Adapter for Atari Joysticks – 2 Ports
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File:Rear ports of original Atari 520ST (crop and filter).jpg - Wikimedia Commons
Atari joystick port - Wikipedia
General Purpose port - MSX Wiki
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Atari joystick port - Wikipedia
Atari Retro Joystick USB adapter – Make or Buy – 2 and 4 ports
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Colecovision Atari 2600 Y Cable Splitter Port Saver for use with Keypa – RetroGameBoyz
