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In vectored interrupts, how does the device identify itself to the processor?

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In vectored interrupts, how does the device identify itself to the processor?

(a) By sending its device id

(b) By sending the machine code for the interrupt service routine

(c) By sending the starting address of the service routine

(d) None of the mentioned

I got this question in an interview.

Question is taken from Interrupts in section Input/Output Organisation of Computer Architecture

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Right choice is (c) By sending the starting address of the service routine

To explain: By sending the starting address of the routine the device ids the routine required and thereby identifying itself.

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