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When you squeeze the trigger, the game electronics very rapidly move a small bright square in a scanning pattern across the screen, keeping the background dark. . The gun you're holding contains a single photocell with a small lens system in front of it that causes only the small spot on the screen the gun is pointing directly at to be focused on the photocell.
When the game sees a voltage peak from the photocell, it knows that the currently illuminated square in the screen is the one the gun is pointed at and registers a shot at that screen position. This all happens so fast that all you see is a single big flash on the screen, which looks reasonable as a muzzle flash from the gun.
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