Only tangentially related to 6502, but it's such a clever design that I couldn't not share it.

https://www.youtube.com/watch?v=V6XnSvB34y8

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probably the youngest person on this forum

Hm. I never had one of those but I always thought they worked like the old light pens and detected a dot being scanned over the screen. The black screen then white box is clever. Crude for accuracy, but obviously more than good enough for the game.

-Gordon

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Gordon Henderson.
See my Ruby 6502 and 65816 SBC projects here: https://projects.drogon.net/ruby/