The Friendly Orange Glow by Brian Dean

40 years before the internet became popular, an alternate digital universe was the genesis of dungeon games, Flight Simulator, Castle Wolfenstein, Freecell, Lotus Notes, chat rooms, email, the first online community, and Richard Powers' novel Galatea 2.2. The Plato System flourished nationally and then disappeared from our memory. This is the first book to tell its story. - Dave