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Chapter 4 Appendix
2.
Interrupt Lines
Interrupt lines are assigned as factory settings as shown below. Use this table as a reference when you add
optional devices.
•
Interrupt lines
As factory settings, interrupt lines are assigned as follows.
IRQ
0
1
2
3
4
5
6
7
8
9
10
11
156
Peripheral Device (Controller)
System timer
−
−
COM 2 serial port
COM 1 serial port
PCI
−
PCI
Real-time clock
Microsoft ACPI Compliant System
PCI
Motherboard resource
Express5800/R120e-2M User's Guide
IRQ
Peripheral Device (Controller)
12
SM Bus
13
Numeric data processor
−
14
−
15
16
VGA, LAN1
17
LAN2, SATA
−
18
−
19
20
USB
21
USB
22
USB
23
USB
2. Interrupt Lines
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