The Apple II (1977), Commodore 64 (1982) and Commodore Amiga (1985) all represent enough of a change, moving out of the research labs and into artist studios, that it's a whole other era.
Casey Reas, Casey Reas on the History of Generative Art - Part 2
To go back, I got my first computer when I was eleven. It was a Commodore 64, mostly because I was playing a lot of video games.
Joshua Davis, 1990s Net Art: Auriea Harvey, Joshua Davis, LIA, Draves