OCR A Level Computer Science

1.1: The characteristics of contemporary processors, input, output and storage devices

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Learning Objective:

1.1.1a: The Arithmetic and Logic Unit; ALU, Control Unit and Registers (Program Counter; PC, Accumulator;ACC, Memory Address Register; MAR, Memory Data Register; MDR, Current Instruction Register; CIR).Buses: data, address and control: how this relates to assembly language programs.