this post was submitted on 19 Dec 2023
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They're both DE-9 connectors, but the C64 joystick port is not serial. Each direction on the stick and the fire button are connected to one of the pins on the connector, and a when direction (or the fire button) is pressed that pin has a voltage applied. So effectively it's a parallel connection.
In a serial connection one of the pins is "send" pin and another is "receive". The device then sends data as a bitstream over those two pins.