Eventually I left school and could not take the game with me. Can you say "8-inch floppy"? But somehow I got access to our monstrous matrix printer and put the source code to paper. All two-and-a-half pages of it, including a computer AI and the help text. Software was compact in the days of 31743 bytes of memory.
Too bad the printer jammed a few times and some lines got lost... No idea if I didn't notice, or ran out of paper, but this listing was the only link to Overload I had left then.