Early example of digital glitch art from 1979 - video embedded below:
Digital TV Dinner is a video art clip from 1979 created by Raul Zaritsky, Jamie Fenton, and Dick Ainsworth using the Bally Astrocade console game to generate unusual patterns.
The Bally Astrocade was unique among cartridge games in that it was designed to allow users to change game cartridges with power-on. When pressing the reset button, it was possible to remove the cartridge from the system and induce various memory dump pattern sequences. DIgital TV DInner is a collection of these curious states of silicon epilepsy set to music composed and generated upon this same platform.
Simon Mechanical Brain, an early mechanical “personal computer” devised by Edmund Berkeley in 1949. Schematics and instructions for building Simon were presented in a series of Radio-Electronics magazine articles, allowing any hobbyist to construct one with the proper materials.