Interrupts - Intel DG965MQ Specification

Intel Desktop Board DG965MQ 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 ICH8
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 16. 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 Diskette drive
7 LPT1
8 Real-time clock
9 Reserved for ICH8 system management bus
10 User available
11 User available
12 Onboard mouse port (if present, else user available)
13 Reserved, math coprocessor
14 Primary IDE/Serial ATA (if present, else user available)
15 Secondary IDE/Serial ATA (if present, else user available)
(Note 2)
16 USB UHCI controller 1 / USB UHCI controller 4 (through PIRQA)
(Note 2)
17 AC '97 audio/modem/User available (through PIRQB)
(Note 2)
18 ICH8 USB controller 3 (through PIRQC)
(Note 2)
19 ICH8 USB controller 2 (through PIRQD)
(Note 2)
20 ICH8 LAN (through PIRQE)
(Note 2)
21 User available (through PIRQF)
(Note 2)
22 User available (through PIRQG)
(Note 2)
23 ICH8 USB 2.0 EHCI controller/User available (through PIRQH)
Notes:
1. Default, but can be changed to another IRQ.
2. Available in APIC mode only.
48
(Note 1)
(Note 1)
(Note 1)