1) Stores the memory address where data is to be stored or fetched. a) MAR (Memory Address Register) b) MDR (Memory Data Register) c) PC (Program Counter) d) ACC (Accumulator) 2) Holds data fetched from or to be written to the main memory. a) ACC (Accumulator) b) MAR (Memory Address Register) c) PC (Program Counter) d) MDR (Memory Data Register) 3) Holds the address of the next instruction. a) ACC (Accumulator) b) PC (Program Counter) c) MDR (Memory Data Register) d) MAR (Memory Address Register) 4) Holds the results of calculations carried out in the ALU. a) MAR (Memory Address Register) b) PC (Program Counter) c) MDR (Memory Data Register) d) ACC (Accumulator)

Registers 1 KS4 OCR

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