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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Operating System (OS)
Swapping

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

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Operating System (OS)
A page fault

is an access to a page not currently in memory
is an error is a specific page
is a reference to a page belonging to another program
occurs when a program accesses a page of memory
None of these

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