Technical Reference
63
Interrupts
Table 34. 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 & Play option) / **
6
Diskette drive controller
7 LPT1*
8
Real time clock
9 **
10 **
11 **
12
Onboard mouse port (if present, else user available)
13
Reserved, math coprocessor
14
Primary IDE (if present, else user available)
15
Secondary IDE (if present, else user available)
* Default, but can be changed to another IRQ.
** Dynamically allocated for all PCI/AGP devices and slots.
