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Intel Desktop Board DQ965WC Technical Product Specification
2.5
Interrupts
The interrupts can be routed through either the Programmable Interrupt Controller
(PIC) or the Advanced Programmable Interrupt Controller (APIC) portion of the
ICH8DO component. The PIC is supported in Windows 98 SE and Windows ME and
uses the first 16 interrupts. The APIC is supported in Windows 2000 and Windows XP
and supports a total of 24 interrupts.
Table 15. Interrupts
IRQ
System Resource
NMI
I/O channel check
0
Reserved, interval timer
1
Reserved, keyboard buffer full
2
Reserved, cascade interrupt from slave PIC
3
COM2
4
COM1
5
LPT2 (Plug and Play option)/User available
6
User available
7
LPT1
8
Real-time clock
9
Reserved for ICH8DO system management bus
10
User available
11
User available
12
Onboard mouse port (if present, else user available)
13
Reserved, math coprocessor
14
Serial ATA (if present, else user available)
15
Serial ATA (if present, else user available)
(Note 2)
USB UHCI controller 1 / USB UHCI controller 4 (through PIRQA)
16
(Note 2)
AC '97 audio/modem/User available (through PIRQB)
17
(Note 2)
ICH8DO USB controller 3 (through PIRQC)
18
(Note 2)
ICH8DO USB controller 2 (through PIRQD)
19
(Note 2)
ICH8DO LAN (through PIRQE)
20
(Note 2)
User available (through PIRQF)
21
(Note 2)
User available (through PIRQG)
22
(Note 2)
ICH8DO USB 2.0 EHCI controller/User available (through PIRQH)
23
Notes:
1.
Default, but can be changed to another IRQ.
2.
Available in APIC mode only.
50
(Note 1)
(Note 1)
(Note 1)
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