Sega and Atari controllers use a different pin for power. Standard 3 and 6 buttons Genesis/Mega Drive pads work on an Atari 2600 even if power is applied to the wrong pin, but that just happens "by chance" and you can't assume that any sega controller will work on the Atari. In fact it's generally a bad idea to connect a controller designed for a different console without first ensuring (by reading a schematic or tracing the board) that it won't damage the console, the controller itself, or bo
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