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GCSE Computer Science · key term
A register that temporarily holds data or instructions being transferred to or from memory.
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 temporarily holds data or an instruction being transferred to or from memory.
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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