The method of accessing the I/O devices by repeatedly checking the status flags is ___________

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Question: The method of accessing the I/O devices by repeatedly checking the status flags is ___________

1.Program-controlled I/O

2.Memory-mapped I/O

3. I/O mapped

4.None of the mentioned

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  1.  The method of accessing the I/O devices by repeatedly checking the status flags is ___________
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