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An IRQ allow interface cards to:

  • A.Interrupt the CPU to request service
  • B.Pass data to the CPU to be processed
  • C.Pass data from one card to another
  • D.Pass data to the computers memory

Answer: A

Correct answer: Interrupt the CPU to request service

An interrupt request line lets a card signal that it needs attention, so the processor can attend to it when it is ready instead of polling. Data itself travels over the bus, not over the IRQ line.

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