ITPEC Textbook
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Chapter 1 · HardwarePractice
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CONCEPT PRACTICE

Input/output completion interrupt

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2023 Spring · Morning · Q17

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Q17. A printer prints 400 characters per second. The printer uses interrupt-driven I/O and each character printed requires an interrupt that takes 50 microseconds. What percentage of the printer's CPU is available to do other work during printing? Here, other overhead time for the CPU can be ignored.

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Source: 2023S_FE_AM_Questions.pdf, PDF page 7–8. ID: 2023S-AM-Q017. Explanation written for this textbook.

Original question · Q17
Q17. A printer prints 400 characters per second. The printer uses interrupt-driven I/O and each character printed requires an interrupt that takes 50 microseconds. What percentage of the printer's CPU is available to do other work during printing? Here, other overhead time for the CPU can be ignored.

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