Interrupts - Intel BLKD945GCCR Specification

Intel Desktop Board D945GCCR 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 ICH7
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 13. 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 User available
4 COM1
5 User available
6 Diskette drive
7 LPT1
8 Real-time clock
9 User available
10 User available
11 User available
12 Onboard mouse port (if present, else user available)
13 Reserved, math coprocessor
14 Primary Parallel ATA/Serial ATA – Legacy Mode (if present, else user available)
15 Secondary Parallel ATA/Serial ATA – Legacy Mode (if present, else user available)
(Note 2)
16 User available (through PIRQA)
(Note 2)
17 User available (through PIRQB)
(Note 2)
18 User available (through PIRQC)
(Note 2)
19 User available (through PIRQD)
(Note 2)
20 User available (through PIRQE)
(Note 2)
21 User available (through PIRQF)
(Note 2)
22 User available (through PIRQG)
(Note 2)
23 User available (through PIRQH)
Notes:
1. Default, but can be changed to another IRQ.
2. Available in APIC mode only.
46
(Note 1)
(Note 1)