Practice Addressing Scheme (25.3.1) - Programmed I/O Overview - Computer Organisation and Architecture

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6 sample questions

Question 1.
Define polling in one sentence.
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Think about how a parent checks if a child is ready to play.
Question 2.
What is memory-mapped I/O?
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Consider how a shared space could work.
3Question 3.
What is the main disadvantage of polling?
- It wastes CPU time
- It is too complex
- It requires additional hardware
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Think about how it affects CPU performance.
4Question 4.
True or False: In memory-mapped I/O, I/O device addresses do not overlap with memory addresses.
- True
- False
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Remember what memory-mapped means!
Question 5.
Propose an optimization strategy to reduce CPU time wastage during polling operations in a low-priority system.
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Consider the advantages of being notified versus checking repeatedly.
Question 6.
Compare and contrast the efficiency of memory-mapped and isolated I/O in a scenario with multiple I/O devices.
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Think about the complexity of managing addresses in both schemes.

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