Systems with separate I/O have a second address space for I/O devices as opposed to memory and

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Systems with separate I/O have a second address space for I/O devices as opposed to memory and also a separate category of instructions for doing I/O operations as opposed to memory data transfers. What are the advantages and disadvantages of this method of handling I/O? Name and describe an alternative strategy and discuss how it exhibits a different set of pros and cons.

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