[VIDEO] The 8-bit Guy Explains How Light Pens and Guns Function
The answer is actually fairly simple. Obviously, the CRT monitor is a big dumb box that doesn’t provide feedback. The gun itself is also not particularly complex. It uses a lens that creates a very narrow focus for the light sensor located at the end of the barrel. When you pull the trigger, that light sensor checks to see if there is white light blasting in its direction.
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