7400 competition entry: 7400 ping))) pong

Alex entered his 7400┬áping))) pong video game into the 7400 Logic Competition. It’s a clone of the old TV console classic, but implemented with 7400 logic and 556 timers (twin 555s).

The project took a total of thirty 7400 chips and 556 timers. There is no microcontroller, just discrete logic. It keeps score by the position of a dot on an led matrix, and gives you three lives before the game ends. It beeps when you lose a life, and beeps continuously when you lose all three until you reset it. The ping))) sensor is mounted on the bottom of the controller. A line voltage selection switch from a psu switches between the ping))) sensor and the potentiometer.

Build something that uses or abuses a logic chip and get amazing boards, tools, and other swag. The Open 7400 Logic Competition promotes awareness of the basic building blocks of modern circuits. Devious geeks ignited the computer revolution with discrete logic computers, what can you do? Details and entry form here.

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