A-Level OCR Computer Science Practice Questions and Answers
CPU Central Processing Unit ALU Arithmetic Logic Unit CU Control Unit PC (CPU) Program Counter ACC Accumulator MAR Memory Address Register MDR Memory Data Register CIR Current Instruction Register Define CPU The main processor in a computer system handling data and instructions. Define ALU A circuit that performs mathematical and logical (comparative) operations. Define CU A component that handles data flow with 'control signals'. It also decodes instructions in the FDE cycle. Define PC (CPU) A REGISTER which holds the address of the next instruction to be executed. Define ACC A REGISTER which stores the results of calculations processed by the ALU. Define MAR A REGISTER which stores the address of the memory location currently in use. Define MDR A REGISTER which stores the instructions or data to be executed. Define CIR A REGISTER which stores the instruction while it is being decoded
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