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Which of the following is not a visible register?

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Which of the following is not a visible register?

(a) General Purpose Registers

(b) Address Register

(c) Status Register

(d) MAR

I have been asked this question in exam.

Origin of the question is Registers topic in section Processor & Memory of Computer Fundamentals

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The correct option is (d) MAR

The explanation is: MAR or the memory address register is not a visible register. This register is user inaccessible. It contains the address of the memory block to be read or written to.

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