I taught programming to university students on the BBC Micro - their work was 'saved' on cassettes. Got some disc drives later and so could play Elite while they struggled with the exercises. I was quite amazed at the 3D feel of Elite and how immersed you got, even if it was all green lines. The game I remember being even more impressed with was the free flight simulator (not really simulator, not realistic, just fun) on the first Archimedes. There was also a flight sim game on SGI workstations around then (maybe even a bit later) and the Archimedes one was just as good apart from the fact that you could network the SGIs if you happened to have a few Indigos or Irises lying around.