Sinowin reverse engineered a on flip-disc display to play Tetris.

Back before LED displays and LCD screens were in common use, flip-disc displays were used to display information.  These displays are made up of a grid of discs that are yellow on one side and black on the other.  The discs physically flip to display information.  Sinowin got his hands on one of these displays and decided to reverse engineer it to make a Tetris game.

A adapter board was developed to provide an interface for a Teensy 3.5.  A 2-way joystick module was added and with a “small matter” of programming a Tetris game, the project was ready to go.

Code and schematics for the project can be found on GitHub.