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Explain in details the mechanisms of: a. Programmed 1/0 [5 points] b. Interrupt input/output (5 points) C. DMA (5 points) In your opinion, which one

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Explain in details the mechanisms of: a. Programmed 1/0 [5 points] b. Interrupt input/output (5 points) C. DMA (5 points) In your opinion, which one is the best in terms of the overall speed of computer's operation and why? (10 points)

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