username3711336
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What is the actual difference between the Program Counter and the Memory Address Register? Thank you
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TaoWang
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Program counter stores the memory address of the NEXT instruction to be run, memory address holds the current address being used.
During the fetch decode execute cycle, the memory address is copied from the PC to the MAR for usage.
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Sasaki Haise
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PC = Program Counter holds the next instruction for the 'fetch decode cycle'
MDR - Memory Data Register holds the data to or from the memory location
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