I think core memory is fascinating. It has a long history of interesting applications (including the Apollo space missions) but is largely disused today. The a

I think core memory is fascinating. It has a long history of interesting applications (including the Apollo space missions) but is largely disused today. The article discusses wiring up your own 1-bit core memory within which you can store any bit you'd like. :) https://en.wikipedia.org/wiki/Magnetic-core_memory https://en.wikipedia.org/wiki/Magnetic-core_memory