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When hardware is accessed by reading and writing to the specific memory locations, then it is called ____________

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When hardware is accessed by reading and writing to the specific memory locations, then it is called ____________

(a) port-mapped I/O

(b) controller-mapped I/O

(c) bus-mapped I/O

(d) none of the mentioned

I have been asked this question in an online quiz.

The question is from I/O Subsystem in portion Mass-Storage Structures of Operating System

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The correct choice is (d) none of the mentioned

The explanation is: It is called memory-mapped I/O.

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