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3.1. What is a device controller? [2] 3.2. What is a device driver? [2] 3.3. What are the three fundamental ways for handling I/O? Explain

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3.1. What is a device controller? [2] 3.2. What is a device driver? [2] 3.3. What are the three fundamental ways for handling I/O? Explain each of them and describe what one improves on the other. [4] 3.4. Why is buffering important for accessing I/O devices? Explain Single, Double, and Circular Buffer strategies. [4]

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