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In this video:
If you’ve ever played Duck Hunt or any of the other NES games that used the NES Zapper gun, you probably at one point or another wondered how the game actually knows where on the TV you are aiming the gun when you pulled the trigger. It turns out, the method for accomplishing this is incredibly simple, as is the gun itself.
Want the text version?: http://www.todayifoundout.com/index.php/2010/12/how-the-gun-on-the-original-duck-hunt-game-worked/