Operating System (OS)
The Memory Address Register

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

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Operating System (OS)
The Register - to - Register (RR) instructions

which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, except in the case of store operation when it is also
have both their operands in the main store.
which perform indicated operations on two fast registers of the machine and leave the result in one of the registers.
None of these
All of these

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Operating System (OS)
The advantage(s) inherent to using high level languages is (are)

A greater degree of machine independence
All of these
Fewer people, less management and shorter transition in learning time
None of these
Improved debugging capability, and superior documentation

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