I can't be sure that this is a screenshot of the exact version, there were a great many derivatives...
but my first game was Star Trek on a Research Machines 380z:
http://www.flickr.com/photos/mwichary/2190359248/
which is the only computer I know of that you can set on fire with software.
The discovery of the source code for Star Trek got me more hooked on game development than playing the damn things...