Fun rabbit hole here about the III FR80, the computer used to make the effects. 1970s computer that could scan and print to film stock. There's a great website that's preserved a lot of info on this computer here: http://www.chilton-computing.org.uk/acl/technology/fr80/over...

III (or Triple-I) was a computer company founded by Edward Fredkin. He's a fascinating early computer scientist, doing pioneering work in cellular automata, reversible computing, as well as more mundane things like the trie data structure. https://en.wikipedia.org/wiki/Edward_Fredkin