Technical Reference
Interrupts
Table 33. Interrupts
IRQ
NMI
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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) / **
Floppy drive controller
LPT1*
Real time clock
**
**
**
Onboard mouse port (if present, else user available)
Reserved, math coprocessor
Primary IDE (if present, else user available)
Secondary IDE (if present, else user available)
*Default, but can be changed to another IRQ.
**Dynamically allocated for all PCI/AGP devices and slots.
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