Operating System (OS)
A program

is a device that performs a sequence of operations specified by instructions in memory.
is a sequence of instructions
None of these
is the device where information is stored
is typically characterized by interactive processing and time of the CPU

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Operating System (OS)
Swapping

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

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Operating System (OS)
The instruction register

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 group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
contains the address of the memory location that is to be read from or stored into.
is a hardware memory device which denotes the location of the current instruction being executed.
None of these

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