Arduino Joystick Emulator for Commodore 64

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We rigged up some parts laying around (Arduino, db9 connector, bits of wire) to interface a PC to the C64 game port and emulate joystick movement. The joystick positions are active when low. We set the pin output to low and toggled the Arduino pin mode between input and output to switch between hi-z and low (common ground between Arduino and C64).
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