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I was reading a textbook on COA, it says I have attached the corresponding passage

If the processor is going to ignore the interrupt request line till the execution of the first instruction of the ISR, how will it know which device to service? I mean the processor is ignoring the interrupt requests so how does it acknowledge the request in the first place?

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  • $\begingroup$ Don't use images as main content of your post. This makes your question impossible to search and inaccessible to the visually impaired; we don't like that. Please transcribe text and mathematics. You can use LaTeX. $\endgroup$
    – D.W. ♦
    Aug 5, 2022 at 7:09
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    $\begingroup$ We require you to provide proper attribution for the original source of all material originally written by others: cs.stackexchange.com/help/referencing $\endgroup$
    – D.W. ♦
    Aug 5, 2022 at 7:09
  • $\begingroup$ This mechanism is meant to prevent spurious interrupts after the initial interrupt has been sensed by the processor. $\endgroup$
    – Yves Daoust
    Aug 5, 2022 at 7:40

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