I'm testing your retro-computing trivia skill today. If you know a bit about old computers you might be familiar with magnetic core memory, which stored information in ferrite rings by creating magnetic fields in them. Core memory was at its peak in the 1960s and was used in a wide variety of computer systems.
Bonus points if you have heard of bubble memory, which was briefly a thing in the 70s and is basically a miniaturized version of core, that created magnetic fields in bubbles of a film substrate.
...but do you know about twistor memory? Twistor memory was in commercial use between these two for the briefest period - really only for a couple years in the late 1960s.
Twistor memory was by design very similar to magnetic core memory, but it used a ribbon of magnetic tape woven into the matrix instead of ferrite beads.
The result was cheaper, faster, and lower power than magnetic core memory.. but lasted just a few years until dynamic RAM + magnetic hard disk systems made it obsolete.
