GCSE Computer Science (OCR) Questions with 100% Correct Answers

GCSE Computer Science (OCR) Questions with 100% Correct Answers Arithmetic Logic Unit (ALU) - Performs operations on data e.g. Addition, subtraction Control Unit (CU) - Coordinating activities of the CPU Registers - Quick, small stores of data within the CPU Memory Address Register (MAR) - Holds memory address for data or a instruction about to be used by the CPU Memory Data Register (MDR) - Holds actual data or instruction Accumulator - Stores results of calculations in the ALU Program Counter (PC) - Holds memory address of the instruction for each cycle Fetch - The next instruction is retrieved by CPU from main memory Decode - The instruction is broken down and decided so computer can understand Execute - The CPU performs what the instructions told