Control unit (CU), Decodes the instructions; controls the timing of operations in the CPU, Arithmetic Logic Unit (ALU), Performs arithmetic and logic operations, Registers - PC, Program counter for the next instruction, Registers - MAR, Memory address register for the memory location of data to be fetched, Registers - MDR, Memory data register for the data retrieved from RAM, Registers - ACC, Accumulator stores the results from the ALU.

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