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To calculate the physical memory address of the next instruction executed by a microprocessor, you typically use the program counter (PC), which holds the address of the next instruction to be fetched. The PC is incremented after each fetch, usually by the size of the instruction that was executed. In systems with paging or segmentation, you may also need to consider the current values of the segment registers or page tables to translate virtual addresses to physical addresses correctly. Thus, the physical address can be derived from the PC value, along with any necessary address translation mechanisms.

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