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In the tutorial on GCSE revision (OCR 1.1), key CPU registers are explained. The Memory Address Register (MAR) stores the address for data fetching or storing, while the Memory Data Register (MDR) holds the data being retrieved from or sent to memory. The Program Counter (PC) tracks the next instruction's address to be executed, and the Accumulator (ACC) maintains the current value during calculations in the Arithmetic Logic Unit (ALU). These registers are crucial due to their speed and proximity to the CPU, although they have limited data storage capacity. Understanding these components is essential for grasping computer architecture concepts.