Looks like core memory. an array of doughnut-shaped magnets which are read and written via the intersections of the grid of electrical wires running through them.
Thirty years ago, this was the standard for memory in electronics. The core memory boards were hand woven at first (this photo was from a board with the largest cores I have seen… an early model). Over time, the cores became smaller, more tightly packed, and machine woven. I just posted an example of that.
So, wait, the crossing wires never touch? So the magnetism at the intersections captures the value? How bizarre! I never got around to looking into how core memory worked!
The wires are likely coated in enamel so the conductors can’t touch. However, the magnetic fields created by currents in the wires are not stopped by the enamel and can interact with the iron cores.
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