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please solve this question What are the differences between the memory-mapped I/O and isolated I/O ? What are the differences between NMI interrupt and other

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What are the differences between the memory-mapped I/O and isolated I/O ? What are the differences between NMI interrupt and other external hardware interrupts? Is it possible to modify ICW3 or ICW4 in an 8259 chip by sending them to the corresponding address without resending the other initialization commands? Explain your

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