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Hardware Emergency Room:   IRQ
 
Contents: Typical IRQ Assignments

Typical IRQ Assignments
 
IRQ Standard Function Typical Usage
0 System Timer integrated component (IC)  
1 Keyboard controller IC  
2 Second IRQ controller IC  
3 Serial port 2 (COM2) COM 2: Internal modem
4 Serial port 1 (COM1) COM 1:
5 Sound/Parallel port 2 (LPT2) Sound card
6 Floppy disk controller board Floppy controller
7 Parallel port 1 (LPT1) LPT1:
8 Real-time clock (RTC)  
9 Unused (redirected to IRQ 2) Network card
10 Unused USB
11 Unused SCSI adapter
12 Motherboard mouse port/Unused Motherboard mouse port
13 Math coprocessor  
14 Primary IDE Primary IDE (hard disks)
15 Secondary IDE/Unused Secondary IDE (CD-ROM, tape drive)
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Disclaimer:  These pages are provided for information purposes only.  We cannot be held responsible for any damage you might inflict on your system while using the information contained herein.  We recommend you always refer any technical matter that is "over your head" to a qualified computer technician.
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2011 Double-Hammer Computer Services.  All rights reserved.
Last Updated: September 04, 2011

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