Computer Hardware 0.0 / 5 ? ICTDigital DataGCSECCEA Created by: tasdfadCreated on: 12-03-18 10:56 RAM Random Access Memory 1 of 12 ROM Read Only Memory 2 of 12 ALU Arithmetic Logic Unit 3 of 12 CPU Central Processing Unit 4 of 12 IAS Immediate Access Store 5 of 12 MAR Memory Address Reader 6 of 12 MDR Memory Data Reader 7 of 12 IAR Instruction Address Register 8 of 12 What does the MAR do? Stores the current instruction or data being executed 9 of 12 What does the MDR do? Temporarily holds the instruction fetched 10 of 12 What does the IAR do? Holds the current instruction to be executed 11 of 12 What does the ALU do? Carries out the logical part of the instruction for example a calculation 12 of 12
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