Operating System (OS)
A partitioned data set is most used for

None of these
storing program data
storing backup information
a program or source library
storing ISAM files

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Operating System (OS)
The instruction register

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 group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
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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