Operating System (OS)
A co-processor

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

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Operating System (OS)
The instruction register

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.
None of these
is a hardware memory device which denotes the location of the current instruction being executed.
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".

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Operating System (OS)
The advantage of a command processor running only built-in commands is:

flexibility to the users in running lists of commands by simply collecting them in named batch command files
users can create system programs and run them as commands
the command set being common across different hardware configurations
the processing is much faster than would other-wise be the case when user defined commands are used
None of these

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