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

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

All of these
many functions do not have to be implemented twice.
more flexibility is available to the programmer in that he may use all the features of the assembler in conjunction with macros.
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

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Operating System (OS)
A relocate program form is one which

None of these
consists of a program and relevant information for its relocation.
All of these
can itself performs the relocation of its address-sensitive portions.
cannot be made to execute in any area of storage other than the one designated for it at the time of its coding or translation.

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