Operating System (OS)
The instruction register

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

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Operating System (OS)
Multiprogramming systems:

execute each job faster
None of these
are used only on large mainframe computers
execute more jobs in the same time period
are easier to develop than single programming system

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Operating System (OS)
Backups should be done

as several incrementals, followed by an image copy
as several image copies, followed by an incremental
daily for most installations
weekly for most installations
None of these

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