User`s manual

System Resources 69
MI-110
B.5 Interrupt Request (IRQ) Lines
IRQ Lines PIC Mode
Table B-5: IRQ Lines PIC Mode
Note(1): These IRQs can be used for PCI devices when onboard
device is disabled. If IRQ is from ISA, user must reserve IRQ for ISA in
BIOS setup menu.
IRQ#
Typical Interrupt
Resource
Connected to Pin Note
0 System timer N/A No
3
Communications port
(COM2)
IRQ3 via SERIRQ,
IRQ3 at ISA bus
Note (1)
4
Communications port
(COM1)
IRQ4 via SERIRQ,
IRQ4 at ISA bus
Note (1)
5
Intel® 82801G (ICH7)
SMBus controller - 27DA
8
System CMOS /
Real-time clock
9
Microsoft ACPI-compliant
system
10
Communications port
(COM3)
IRQ10 via SERIRQ,
IRQ10 at ISA bus
Note (1)
11
Communications port
(COM4)
IRQ11 via SERIRQ,
IRQ11 at ISA bus
Note (1)
13 Numeric data processor
14 Primary IDE controller