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Operating Systems Concepts - Engineering

Q1:

The Memory Buffer Register (MBR)

A is a hardware memory device which denotes the location of the current instruction being executed.

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

C contains the address of the memory location that is to be read from or stored into.

D 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".

E None of the above

ANS:D - 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".

MAR emits instruction to address bus so that the specific cell in the memory is activated. MAR also emits READ or WRITE command to control bus. MBR emit data for WRITE actions to data bus.