With the renewed interest in the Apollo missions and the associated hardware, especially the AGC (Apollo Guidance Computer), here I explain the amazing technology that is Core Rope Memory and build a working example! I must stress that this is 'conceptual' and massively simplified but it does demonstrate some of the principles used in Core Rope Memory without getting into the complexity of actual production versions. In fact you may wish to look up IBM's 'Transformer Read-Only Storage' that is very clever and works in a similar way to the example I have built! Correction: I do talk of the cores as being really small but I am of course confusing them with those in Magnetic Core Memory! Those are the really tiny ones!
Have a look at Magnetic Core Memory Explained (Video 179) https://youtu.be/T8VreNzldWc
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Very many thanks, F-J