Practice Programmed I/o Overview (25.1) - Programmed I/O Overview - Computer Organisation and Architecture

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9 questions

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6 sample questions

Question 1.
What is programmed I/O?
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Look for how the CPU interacts with devices in a direct manner.
Question 2.
Define polling.
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Think about a wait-and-see method employed by the CPU.
3Question 3.
What is the main drawback of polling in programmed I/O?
- Increased efficiency
- Wasted CPU time
- Immediate device readiness
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Think about what happens when the CPU is waiting.
4Question 4.
True or False: Memory-mapped I/O and isolated I/O use the same addressing scheme.
- True
- False
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Consider how devices are recognized by the CPU.
Question 5.
Analyze the effects of CPU time wastage due to polling on system performance and suggest improvements.
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Consider productivity in environments relying on I/O.
Question 6.
Design a simple programmed I/O routine for a CPU to read from an input device and explain each step.
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Break down the routine into logical sequences.

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