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Joystick information and circuits
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Retro 9 Pin Joystick to USB Converter : 4 Steps (with Pictures) - Instructables
commodore 64 - Would a multi button controller have been possible on the C64? - Retrocomputing Stack Exchange
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How to connect old Atari style joystick to bluetooth PCB? - Electrical Engineering Stack Exchange
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Ardunio Micro Joystick Card | The Sim
Making a 9 Pin Joystick Cable (for Sega Genesis, Commodore 64, ColecoVision, Atari, etc.) - YouTube
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Retro 9 Pin Joystick to USB Converter : 4 Steps (with Pictures) - Instructables
9pin Joystick Controller Cable for Atari 2600 Commodore C64 Vic-20 Ami – RetroArcadeCrafts
Retro Isle - Spectrum Joysticks
The Atari joystick Pinout Common Ground. - Atari 8-Bit Computers - AtariAge Forums
