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How to hook up an atari to a modern television set
Plug in the atari to an outlet.
It's obviously not going to work unless it has some power.
If you have the original tv/game switchbox that came with the atari console, you can try to hook this up.
Unless your television is old enough to still have places to screw the two wires with the u-shaped things on the end, you will need an adapter. Purchase an adapter for about $5.