Multiple choice networking

By default, COM1 uses what IRQ?

  1. 1

  2. 2

  3. 3

  4. 4

  5. 5
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

COM1 traditionally uses IRQ4 on PC-compatible systems. This is a standard hardware configuration that dates back to the original IBM PC design. COM ports use specific IRQ assignments: COM1 and COM3 share IRQ4, while COM2 and COM4 share IRQ3. Knowing these defaults is essential for troubleshooting hardware conflicts.

Keep practicing — related questions