MEMORIA A NUCLEI MAGNETICI

Magnetic core memory is a type of non-volatile computer memory. With the use of small ceramic or ferrite magnetic rings it stores digital information by changing the polarity of the magnetic field of the rings. Used in electronic computers mainly from 1955 to 1975 instead of drum memories, cheap but slow, and thermoionic valves, fast but expensive, was replaced by semiconductor memories.
Core memory is used in the modules shown in the figure. The first module, consisting of multiple core memories stacked and originally mounted inside a metal container, belongs to a DEC PDP-8 computer, has an address equal to 12 bits and has a capacity of 1024 words. The second and third modules, on the other hand, consist of a single memory mounted on a printed circuit board, and belong respectively to a CII Mitra 15 computer, and to an Olivetti computer. The CII module has an address equal to 16 bits and has a capacity of 4096 words.

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