Here's a couple of ways to play NES light gun games on a modern TV.https://www.youtube.com/watch?v=qCZ-Z-OZFUs
There are some unconventional zapper detection techniques that can't really be supported with lag compensation, though.
PinoBatch made a nice version of Pong that let you use the zapper to control the paddle. (Was included in the Action 53 compilation.)
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