Practice Questions Addressing Objectives (25.6.1)

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6 sample questions

Question 1.
What is programmed I/O?
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Think about how the CPU interacts with devices.
Question 2.
Define polling in the context of I/O.
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Consider how often the CPU checks devices.
3Question 3.
What is the main disadvantage of programmed I/O?
- Increased communication speed
- CPU time wastage
- Simpler architecture
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Consider how often the CPU waits for responses.
4Question 4.
True or False: Memory-mapped I/O and isolated I/O can use the same addresses for devices and memory.
- True
- False
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Think about how addresses are allocated.
Question 5.
Consider a system where the CPU polls an input device. Calculate how CPU wasted time scales with the number of devices being polled. Discuss ways to optimize this.
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Think about the implications of adding devices.
Question 6.
Explain how the choice between memory-mapped and isolated I/O affects system design. Give an example of when to prefer one over the other.
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Consider the size and complexity of your system.

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