I am the instructions that are FETCHED from RAM, I hold the ADDRESS of the next instruction., I hold the ADDRESS of the current instruction, I hold the actual DATA the MAR tells me to., I decode the DATA / INSTRUCTION that I receive from the MDR, I increment by 1 and point to the next instruction ADDRESS, I EXECUTE the instruction that I receive from the CU, I hold the calculations from the ALU.

J277 The Fetch Execute Cycle

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