Gun Nintendo
on the Original Nintendo Duck Hunt, how does the gun know where you are aiming?
i was just wondering with the minimal technology back then, how they made the gun "know" where your pointing it
The gun contains a photodiode (or a phototransistor) in the barrel. The photodiode is able to sense light coming from the screen. The gun also contains a trigger switch. The output of the photodiode and the switch are fed to the computer/system controlling the game.
At the same time, the computer is getting signals from the screen driver electronics. If you have read How Television Works, you know about the horizontal retrace and vertical retrace signals used to align the picture on the screen. The screen driver electronics send pulses to the computer at the start of the horizontal and vertical retrace signals, so the computer knows where on the screen the electron beam is located during each frame.
Good question!
Classic Game Room - Top Gun for NES review
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