NEC SP B-Series - Manual (Page 19)

1-8 Technical Information
Interrupt Level Assignments
IRQ System Resource
NMI I/O channel check
00 Reserved, interval timer
01 Reserved, keyboard controller
02 Reserved, cascade interrupt from slave PIC
03 COM2*
04 COM1*
05 LPT2 (Plug and Play option)/audio/user available
06 Diskette drive
07 LPT1*
08 Real-time clock
09 Reserved
10 USB/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.
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