This magnetic read-only memory (ROM), contrary to ordinary coincident-current magnetic core memories (used for RAM), uses the ferrite cores as transformers. If you look at the picture above ...
Don't worry, we're here to explain it to you. This Is Why You Need A Ferrite Core As you've just read, the strange cylinder on your laptop charging cable is a ferrite core, also called a ferrite bead.
And if you are thinking of core memory based on ferrite cores, get ready for a brain stretch, as core rope is quite a bit different, and is even more complicated to read. Which brings us to the ...