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What expansion is this?

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So I am working on a Atari 400 I picked up at a rummage sale (I am new to classic Atari systems) Blank screen so I do a little research and pop it open and find this board inside. It is connected to a SPDT switch that needed to be replaced. I got the 400 working but have no clue what this is or what the switch does. Any help is greatly appreciated.


Edited by skaboytd
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