The guy living across the hall from me at Georgia Tech in about '80 had bought an Apple II with a 50hz power supply. He was an electrical engineer and rigged up a new power supply for US grid. All he had was the motherboard and a keyboard, the screen was an old TV. The memory was a regular audio cassette player. He had a game called “Orbital Mechanic” and we played with it quite a bit. It turns out that the paths of objects thrown from one orbit to another are not so intuitive - so it was a real challenge to toss a wrench from Astronaut A in orbit 1, to Astronaut B in orbit 2. That game used WASD for aiming the throw, and when I later began playing PC games, I wondered if that old game might have been the originator of the concept or if it goes even further back.