James Leatham, one of the a regular commenter on my blog just posted links to this amazing movie he made on his Apple IIe in 1985. The graphics are way beyond the capability of the computer to render in real time, so he used stop-motion. To film it he actually had the computer control a film camera and a wheel of colored filters. The computer would render a frame, spin the color wheel (made from an old record with holes cut in it) then open the shutter, repeating for each color and frame. It took about 2 minutes per frame but the results are awesome.
Link to an article he wrote in Cinemagic magazine describing how he did it.
Link to his original comment.