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In this tutorial, key CPU registers are explained: the Memory Address Register (MAR) stores the address for data fetching or storing in memory, while the Memory Data Register (MDR) holds the data being fetched from or sent to memory. The Program Counter (PC) tracks the next instruction's address for execution. The Accumulator (ACC) keeps a running total of calculations performed by the Arithmetic Logic Unit (ALU). These registers are crucial for efficient processing as they are located within the CPU, but they have limited data storage capacity. Understanding these registers is essential for GCSE revision.
