Intel Desktop Board D865PCD Technical Product Specification
2.6 Interrupts
The interrupts can be routed through either the Programmable Interrupt Controller (PIC) or the Advanced Programmable Interrupt Controller (APIC) portion of the ICH5 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 14. Interrupts
IRQ
NMI
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16(Note 2)
17(Note 2)
18(Note 2)
19(Note 2)
20(Note 2)
21(Note 2)
22(Note 2)
23(Note 2)
Notes:
System Resource
I/O channel check
Reserved, interval timer
Reserved, keyboard buffer full
Reserved, cascade interrupt from slave PIC
COM2
COM1
LPT2 (Plug and Play option)/User available
Diskette drive
LPT1
Reserved for ICH5 system management bus
User available
User available
Onboard mouse port (if present, else user available)
Reserved, math coprocessor
Primary IDE
Secondary IDE
USB UHCI controller 1 / USB UHCI controller 4 (through PIRQA)
AC ‘97 audio/modem/User available (through PIRQB)
ICH5 USB controller 3 (through PIRQC)
ICH5 USB controller 2 (through PIRQD)
ICH5 LAN (through PIRQE)
User available (through PIRQF)
User available (through PIRQG)
ICH5 USB 2.0 EHCI controller/User available (through PIRQH)
1.Default, but can be changed to another IRQ.
2.Available in APIC mode only.
40
