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GCSE Computer Science · key term
A register that holds the address of the memory location being accessed to read or write data or instructions.
Used by OCR
Paper 1
Revise: CPU Components and FunctionsThe MAR would hold the address 200 when that location is accessed, whereas the MDR would hold the value 17 when it is read.
The CPU register that holds the address of the memory location being accessed to read or write data or instructions.
For a register question, state both its purpose and what it stores. PC and MAR store addresses; MDR and ACC store contents rather than addresses.
Distinguish an address from its contents: the MAR and PC hold addresses; the MDR holds transferred data or instructions.
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