Operating System (OS)
A co-processor

Is quite common in modern computer
Works with any application
Causes all processor to function equally
Is relatively easy to support in software

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Operating System (OS)
The instruction register

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.
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

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