Interrupt Request Lines (IRQ)
Interrupt Request Lines is what hardware devices use to get the attention of the CPU.
#
0 System Timer (Cannot be changed)
1 Standard 101/102-key or Microsoft Natural PS/2 Keyboard (Cannot be
changed)
2 Cascaded signals from IRQs 8–15 (any devices configured to use IRQ 2 will
actually be using IRQ 9);
3 Communications Port (COM2) Serial Port 2 or 4
4 Communications Port (COM1) Serial Port 1 or 3
5 LPT port 2 or Sound Card
6 Standard floppy disk controller
7 LPT port 1 or Sound Card
8 System CMOS/real-time clock
9 Microsoft ACPI-Compliant System/SCSI/Free
10 Multimedia Audio Controller/SCSI/NIC/Free
11 SCSI/NIC/Free
12 PS/2 Connected Mouse
13 Math Co-Processor/Integrated Floating Point Unit
14 Primary IDE Channel
15 Secondary IDE Channel
17 PCI Ethernet Adapter
19 USB Universal Host Controller
#
0 System Timer (Cannot be changed)
1 Standard 101/102-key or Microsoft Natural PS/2 Keyboard (Cannot be
changed)
2 Cascaded signals from IRQs 8–15 (any devices configured to use IRQ 2 will
actually be using IRQ 9);
3 Communications Port (COM2) Serial Port 2 or 4
4 Communications Port (COM1) Serial Port 1 or 3
5 LPT port 2 or Sound Card
6 Standard floppy disk controller
7 LPT port 1 or Sound Card
8 System CMOS/real-time clock
9 Microsoft ACPI-Compliant System/SCSI/Free
10 Multimedia Audio Controller/SCSI/NIC/Free
11 SCSI/NIC/Free
12 PS/2 Connected Mouse
13 Math Co-Processor/Integrated Floating Point Unit
14 Primary IDE Channel
15 Secondary IDE Channel
17 PCI Ethernet Adapter
19 USB Universal Host Controller