Operating System (OS)
The Memory Address 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.
None of these
is a hardware memory device which denotes the location of the current instruction being executed.

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Operating System (OS)
System maintenance:

always requires several programs
is not required if the system is well written
None of these
is usually not necessary
is necessary on all systems, regardless of how good

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Operating System (OS)
System generation:

is always quite simple
None of these
is always very difficult
varies in difficulty between systems
requires extensive tools to be understandable

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