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Core memory

To Steve,

Thanks for explaining the core-memory so clearly (Your ascii-art looks great)

>Although it takes more current to read or write a core than it takes to
>update a semiconductor memory cell, no power is required to maintain the
>state of core memory.  It wasn't until about the mid-70s that
>semiconductor memory became all of faster, denser, less power-intensive,
>and cheaper than equivalent amounts of core memory, and core was still
>used for some time after that.

Why doesn't the magnetic field in the ferrite core degrade? (I assume the
ferrite has some resistance.)