Old computers were so much more fun. I remember watching some of those PBS and TVOntario computer shows. Computers were so mysterious back then.
I also liked documentaries in the early 80's that had some of the first 3D rendering. There was an '83 or '84 (BBC?) documentary on Halley's Comet that had some really neat (for the time) 3D satellite renderings (great music too). Even earlier than that was a show on computer graphics that showed a 3D animation of a guy in a top-hat juggling. I wish I could find those shows.