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General Purpose port - MSX Wiki
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Atari joystick port - Wikipedia
General Purpose port - MSX Wiki
Atari CX40 joystick - Wikipedia
Atari joystick port - Wikipedia
Male Joystick Port - Atari 2600, 7800, Colecovision - NOS CO19062
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TV game joysticks
Atari 7800 joypad to MSX Adapter | danjovic | Hackaday.io
Atari 2600 Video Touch Pad Controller Keypad Adapter | eBay
raphnet. - Genesis/SMS/Atari controller to USB adapter
The Atari joystick Pinout Common Ground. - Atari 8-Bit Computers - AtariAge Forums
Building the Circuit | AtariFruit 2600 Joystick | Adafruit Learning System