Multiple choice general knowledge science & technology

Which IRQ does COM1 commonly use?

  1. 3

  2. 4

  3. 6

  4. 7
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

COM1 (the first serial port) traditionally uses IRQ 4 on PC systems. COM2 uses IRQ 3, while IRQ 6 is for floppy controller, and IRQ 7 is for printer port (LPT1). These IRQ assignments are part of the standard PC architecture.

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