Electro-Mechanical Pong Game Caught On Video
By James Grahame
This electromechanical Pong game is wonderfully intricate. The playing field isn't a video display; the ball and paddles are attached to servo-controlled cables between two sheets of glass. Each player uses a joystick to drive a simple logic circuit made from telephone relays. There are no microcontrollers or integrated circuits in the entire system and three sensors on each paddle determine whether the ball will be deflected right, left, or straight ahead.
The score counters go from 1 to 5 and the numbers are displayed on two rotating discs; as soon as a player gets five points, the game resets. The sound effects (all two of them) are created using solenoid plungers. Very cool and completely impractical at the same time; I want one! [Update: karramarro left a link to the creator's site in the comments - I've added it below!]
Niklas Roy's Pongmechanic Site (via Papel Continuo)