Operating System (OS)
Swapping

works best with many small partitions
None of these
allows each program in turn to use the memory
allows many programs to use memory simultaneously
does not work with overlaying

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Operating System (OS)
The instruction register

is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
None of these
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".
is a hardware memory device which denotes the location of the current instruction being executed.
contains the address of the memory location that is to be read from or stored into.

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