Originally it was going to be the Commodore Amiga showcasing a real-time animation, but Commodore's demands were a little excessive and so the Macintosh with a screen showing a pre-rendered animation from a different computer piped in (based on the size of the icons and GUI being much larger, not to mention the size of all that overscan, it probably wasn't even created on a real Mac to begin with*... so it's not just film framerate a factor involving a telerecording/kinescope scene as the CRT has to be calibrated to synchronize with the film's FPS to prevent the sort of cool flicker that so many amateur youtuber video makers somewhat understandably love to harp on about) was used instead and Mac definitely propelled forward as a result.
The goofiest part is, some other scenes in the movie clearly show that classic 40-character style Amiga graphics and typefaces (e.g. Spock's reeducation scene where he uses multiple terminals simultaneously, like Arnold J Rimmer had in the classic Red Dwarf episode "Holoship" (where they were using Amiga computers as the keyboards and monitors are dead giveaways, but I digress) so why Commodore demanded the movie production purchased the unit outright instead of lending one out for free product placement, in one of the few times one could buy into product placement being shoved into a sci-fi movie without it feeling just as much "fish out of water" but only inversely (e.g. 20th century goodies now available in the 23rd century just like how all the horse'n'buggy makers in 1723 still exist nowadays... to be fair, some beer companies did start shop in the 1800s and still exist, so it's not impossible... but not for every device and brand out there and usually sci-fi in the future has a field day with the trite trope of saying all of yesteryear's brands no longer exist.
* Web searches suggest Apple II or a more powerful Silicon Graphics (SGI) workstation were used to create the phony visuals piped into the modified Mac CRT that Scotty was typing inanely into
Given how 80s things were at the time, I'm amazed Jack Tramiel (now of Atari Corp) didn't try to get the ST Computer (released in 1985, before the Amiga 1000 had but also without Andy Warhol and Debbie Harry helping) on display for the scene with what was dubbed "The Jackintosh" as the ST could emulate a Mac and run Mac software
faster.
Disclaimer: I didn't watch the video but, if it helps, I'll some hum background noises while you read this...
