Though no one has done it yet, Alan Kay is convinced a modest Spacewar could be built cheap: “You can do motion with a couple of integrators. Heathkit has this l6-integrator analogue computer you can build as a kit for 700 bucks or something like that. You have to have two layers of integrators to get an inverse-square law, so you should be able to get gravity and orbits with that one. To make spaceship outlines and explosion patterns you need a few bits of digital memory. Two chips worth of register file should do it. I think electronics stores may carry the chips.
Funny that Atari's first game Computer Space was developed the year before the article went to press, with an old black-and-white TV and some cascading digital counter chips, similar to how PONG would later simulate ball motion. And the spaceship outlines were literally outlined on the circuit board with diodes: http://www.masswerk.at/rc2017/04/images/e02-computerspace-di...
Funny that Atari's first game Computer Space was developed the year before the article went to press, with an old black-and-white TV and some cascading digital counter chips, similar to how PONG would later simulate ball motion. And the spaceship outlines were literally outlined on the circuit board with diodes: http://www.masswerk.at/rc2017/04/images/e02-computerspace-di...