Fetch: The program counter starts at 0000, which indicates the location of the data content in RAM, The address 0000 is copied into the memory address register (MAR), through address bus, A signal is now sent down through the address bus to the RAM., The data contents are copied to memory data register (MDR), through the data bus, The program counter is incremented by 1, pointing at the next address of the next instruction, The data content fetched, which is an instruction is copied into the current instruction register (CIR), in control unit (CI), Decode: Instruction contents is passed to the CU via data bus, CU decodes to an instruction set in machine code, Execute: Arithmetic logic unit (ALU) will process all the mathematical and logical calculations., Accumulator (ACC) will store all the interim values, CU sends out signals via control bus to the various components of the computer to execute the instructions,

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