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The main difference between memory mapped input/output and isolated input/output is given below:

With memory-mapped I/O, there is a single address space for memory locations and I/O devices. The processor treats the status and data registers of I/O modules as memory locations and uses the same machine instructions to access both memory and I/O devices. With isolated I/O, a command specifies whether the address refers to a memory location or an I/O device. The full range of addresses may be available for both.


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