Technical Information 1-5
Table 1-3 Interrupt Level Assignments
IRQ
System Resource
NMI
I/O channel check
00
Reserved, internal timer
01
Reserved, keyboard controller
02
Reserved, cascade interrupt from slave PIC
03
COM2*
04
COM1*
05
Sound/User available
06
Diskette drive
07
LPT1*
08
Real-time clock
09
PCI/User available
10
User available
11
Windows Sound System*/User available
12
PS/2 mouse port (if present, else user available)
13
Reserved, numeric processor
14
Primary IDE (if present, else user available)
15
Secondary IDE (if present, else user available)
* Default; setting can be changed.
Table 1-4 DMA Assignments
DMA
Resource
00
Audio
01
Audio/Parallel port
02
Diskette drive
03
ECP parallel port/Audio
04
Reserved, cascade channel
05
Available
06
Available
07
Available