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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
External SIO - COM2
Yes (No)
4
External SIO - COM1
Yes (No)
5
PCI
for PCI
6
External SIO
Yes (No)
7
External SIO - LPT1
Yes (No)
8
RTC
No
9
ACPI
No
10
PCI
for PCI
11
PCI
for PCI
12
PS/2 Mouse
Yes (No)
13
FPU
No
14
Primary IDE
No
15
PCI
for PCI
(1) If the "Used For" device is disabled in setup, the corresponding interrupt is available
for other devices.
5.1.2
In APIC mode
IRQ#
Used For
Available
0
Timer 0
No
1
Keyboard
No
2
Slave 8259
No
3
External SIO - COM2
Yes (No)
4
External SIO - COM1
Yes (No)
5
PCI
for PCI
6
External SIO
Yes (No)
7
External SIO - LPT1
Yes (No)
8
RTC
No
9
ACPI
No
10
PCI
for PCI
11
PCI
for PCI
12
PS/2 Mouse
Yes (No)
13
FPU
No
14
primary IDE
No
15
PCI
for PCI
16
PIRQ[A]
For PCI
17
PIRQ[B]
For PCI
18
PIRQ[C]
For PCI
19
PIRQ[D]
For PCI
20
PIRQ[E]
No
21
PIRQ[F]
No
22
PIRQ[G]
No
23
PIRQ[H]
No
47
Comment
-
-
-
Note (1)
Note (1)
Dynamic (BIOS default)
Note (1)
Note (1)
-
-
Dynamic (BIOS default)
Dynamic (BIOS default)
Note (1)
-
Note (1)
Dynamic (BIOS default)
Comment
-
-
-
Note (1)
Note (1)
Dynamic (BIOS default)
Note (1)
Note (1)
-
-
Dynamic (BIOS default)
Dynamic (BIOS default)
Note (1)
-
Note (1)
Dynamic (BIOS default)
PCI IRQ line 1 + US15W graphics + USB UHCI Controller #1; Note (2)
PCI IRQ line 2 + LAN Controller + USB UHCI Controller #2; Note (2)
PCI IRQ line 3 + USB UHCI Controller #3; Note (2)
PCI IRQ line 4 + USB UHCI Controller #3; Note (2)
Note (2)
Note (2)
Note (2)
Note (2)
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