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Which register in the processor is single directional?

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Which register in the processor is single directional?

(a) MAR

(b) MDR

(c) PC

(d) Temp

This question was addressed to me during an online interview.

The above asked question is from Single BUS Organisation in division Memory System of Computer Architecture

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The correct choice is (a) MAR

Explanation: The MAR is single directional as it just takes the address from the processor bus and passes it to the external bus.

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