Modding a NES to run Unisystem VS arcade games

This is the schematic diagram for the original arcade version of Pong, the first digital video game. Unlike other video games of that era, Pong utilized an entirely digital circuit to generate graphics, sound, and game control. It operates without...

This is an old periscope game where players hunt down ships that pass by in the dark. Upon powering it on, a loud 60Hz hum was heard from the audio circuit. The game started, but aiming was inaccurate, and ships...