Which of the following is the IRQ that can be used by either COM 1 or COM 3?
A)4
B)0
C)1
D)3

Name: Which of the following is the IRQ that can be used by either COM 1 or COM 3? A)4 B)0 C)1 D)3
Brand: Quizplus
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Question

Quizplus · Accepted Answer

IRQ 4 is used by either COM1 or COM3.
Key Takeaway: IRQ, or Interrupt Request, is a special numbered channel that is used by devices to get the processor's attention. By default, COM 1 and COM 3 use IRQ 4, and COM2 and COM4 use IRQ3. The system timer uses IRQ 0, and the keyboard uses IRQ 1.

Which of the Following Is the IRQ That Can Be