A single core could be selected and magnetised by passing

sufficient current through its horizontal and vertical wires. A core would retain its magnetisation until it was re-magnetised. The two possible polarities of magnetisation were used to represent the binary values zero and one.

A third "sense" wire, passed through the core and, if the magnetisation of the core was changed, a small pulse would be induced in the sense wire which could be detected and used to deduce the core's original state.

Some core memory was immersed in a bath of heated oil to improve its performance.

Core memory was rendered obsolete by semiconductor memory.

For example, the 1970s-era NCR 499 had two boards, each with 16 kilobytes of core memory.

Last updated: 1996-03-04

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A single core could be selected and magnetised by passingd be selected and magnetised by passing

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