The majority of machines are able to copy both ways, from one register to another. The Memory Address Register (MAR) is unique among registers in that it is always used as the target of a copy operation.

Systems Architecture
7th Edition
ISBN:9781305080195
Author:Stephen D. Burd
Publisher:Stephen D. Burd
Chapter4: Processor Technology And Architecture
Section: Chapter Questions
Problem 2PE: If a microprocessor has a cycle time of 0.5 nanoseconds, what’s the processor clock rate? If the...
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The majority of machines are able to copy both ways, from one register to another. The Memory Address Register (MAR) is unique among registers in that it is always used as the target of a copy operation. If I may ask, could you elaborate on this?

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