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From The Free On-line Dictionary of Computing (05 January 2017) [foldoc]:
main memory
main store
primary storage
The storage device used by a
computer to hold the currently executing program and its
working data. A modern computer's main memory is built from
random-access memory integrated circuits. In the old days
ferrite core memory was one popular form of main memory,
leading to the use of the term "core" for main memory.
Computers have several other sorts of memory, distinguished by
their access time, storage capicity, cost, and the typical
lifetime or rate of change of the data they hold. Registers
in the CPU are fast, few, expensive and typically change
every few machine instructions. Other kinds are cache,
PROM, magnetic disk (which may be used for {virtual
memory}) and magnetic tape.
(1996-11-04)