Interrupts - Intel BLKD945GNTL - LGA775 1066 800FSB 4DDR2 A/V Lan SATA ATX 10Pack Motherboard Technical Product Specification

Intel Desktop Board D945GNT 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 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 14.

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.
52
(Note 1)
(Note 1)