Operating System (OS)
The Memory Buffer Register (MBR)

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.
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
is a hardware memory device which denotes the location of the current instruction being executed.
None of these

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Operating System (OS)
The advantage(s) of incorporating the macro processor into pass 1 is(are):

more flexibility is available to the programmer in that he may use all the features of the assembler in conjunction with macros.
All of these
Functions are combined and it is not necessary to create intermediate files as output from the macros processor and input to the assembler.
None of these
many functions do not have to be implemented twice.

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