No, I'm not talking about magnetic core memory. Core rope memory also used little magnetic rings. https://en.wikipedia.org/wiki/Core_rope_memory https://en.wi

No, I'm not talking about magnetic core memory. Core rope memory also used little magnetic rings. https://en.wikipedia.org/wiki/Core_rope_memory https://en.wikipedia.org/wiki/Core_rope_memory input wires were energized, and they were coupled (or not) to the output wires depending on if they shared a magnetic ring (or not).