Practice Device Service Routine (25.5) - Programmed I/O Overview - Computer Organisation and Architecture

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9 questions

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6 sample questions

Question 1.
Define programmed I/O.
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Think about how the CPU interacts with I/O devices.
Question 2.
What does polling mean?
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Consider the action of continuously checking something.
3Question 3.
What is the primary function of programmed I/O?
- To automate I/O operations
- To enable CPU control over I/O
- To eliminate the need for I/O devices
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Focus on the control aspect of I/O.
4Question 4.
True or False: Isolated I/O and memory-mapped I/O use the same address space.
- True
- False
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Consider how addresses are allocated in each scheme.
Question 5.
Construct a flowchart that illustrates the steps an I/O operation follows, from initiation to data transfer.
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Use shapes to represent different stages of the process.
Question 6.
In a given memory-mapped scheme, if 255 addresses are reserved for memory and 15 for I/O, how many total devices can be addressed?
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Calculate the number of devices based on the reserved addresses.

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