If you're interested in these types of old technologies, do check out the fantastic youtube channel "Technology Connections".

https://www.youtube.com/channel/UCy0tKL1T7wFoYcxCe0xjN6Q

I found out about it a few weeks ago and am ridiculously happy I did. It immediately jumped in my top 3 favourite channels. Lots of deep dives into how last-century technologies worked, that neither talk down nor overwhelm. And the guy's really funny as well. Look at his videos and choose one you like, or start with one of his playlists such as the story of Laserdisc: https://www.youtube.com/watch?v=Eg8tK1LpLS8&list=PLv0jwu7G_D...