A+ Certification ™ Practice Questions IRQ assignment

Q4. IRQ2 is used with which of the following?

1. COM1

2. COM2

3. LPT1

4. Used to cascade second IRQ controller

Correct Answer: D. CompTIA A+ Certification Training ...practice questions...Explanation follows:

Explanation:

The IRQ numbers and relevant Standard Device Assignment are given below. It is important to memorize
these values before going to the exam, as there would be 5-10 questions on IRQs, and conflicts.

IRQ	Standard device Assignment
0	System Time
1	Keyboard
2	Cascade to IRQ9. Can't be used
3	COM ports 2 and 4
4	COM ports 1 and 3
5	Parallel Port LPT2. Often used for sound cards
6	Floppy drive controller
7	Parallel Port, LPT1
8	Real Time Clock
9	Unassigned (Also redirected from IRQ2
10	Available
11	Available - Usually for SCSI adapter
12	Mouse or touch pads
13	Math co-processor
14	Primary hard-disk IDE controller
15	Secondary hard-disk controller

CompTIA A+ Certification practice questions ...question 4