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5 System Ressources
5.1
Interrupt Request (IRQ) Lines
Please be aware that an ACPI OS decides itself on resource usage. The tables below show only an example distribution.
5.1.1
In 8259 PIC Mode
IRQ#
Used For
Available
0
Timer 0
No
1
Keyboard
No
2
Slave 8259
No
3
COM2
Yes
4
COM1
Yes
5
Free
Yes
6
Floppy Drive Controller
Yes
7
LPT1
Yes
8
RTC
No
9
SCI
No
10
Free
Yes
11
Free
Yes
12
PS/2 Mouse
No
13
FPU
No
14
IDE0
No
15
IDE1
No
1 If the "Used For" device is disabled in setup, the corresponding interrupt is available for
other devices.
2 Unavailable in Advanced Configuration and Power Interface (ACPI) mode. Used as System
Control Interrupt (SCI) in ACPI mode. Currently not free in Non-ACPI mode.
5.1.2
In APIC mode
IRQ#
Used For
Available
0
Timer 0
No
1
Keyboard
No
2
Slave 8259
No
3
COM2
Yes
4
COM1
Yes
5
PCI/LPT2
Yes
6
Floppy Drive Controller
Yes
7
LPT1
Yes
8
RTC
No
9
SCI
No
10
COM3
No
11
COM4
No
12
PS/2 Mouse
Yes
13
FPU
No
14
IDE0
No
15
IDE1
No
16
PIRQ[A]
For PCI
17
PIRQ[B]
For PCI
18
PIRQ[C]
For PCI
19
PIRQ[D]
For PCI
20
PIRQ[E]
No
42
Comment
Note(1)
Note(1)
Note(1)
Note(1)
Note(2)
Note(1)
Note(1)
Note(1)
Comment
Note (1)
Note (1)
Note (1)
Note (1)
Note (2)
Note (1)
Note (1)
Note (1)
Note (1)
Note (1)
PCI IRQ line 1 + Graphics controller + HD Audio Controller + secondary IDE
PCI IRQ line 2 + AC'97 Audio controller
PCI IRQ line 3 + USB UHCI controller #3 + SATA (native mode)
PCI IRQ line 4 + USB UHCI controller #2 + IDE (native mode)
Lan Controller
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