Appendix C. Irq And Dma Channel Assignments - IBM NetVista Technical Information Manual

Appendix C. IRQ and DMA channel assignments

The following figures list the IRQ and DMA channel assignments.
Table 35. IRQ channel assignments
Note: The default settings for COM 1 (IRQ 4), COM 2 (IRQ 3), and LPT 1 (IRQ 7) can
Table 36. DMA channel assignments
© Copyright IBM Corp. 2000
IRQ
NMI Critical system error
SMI System-management interrupt for power management
0 Timer
1 Keyboard
2 Cascade interrupt from slave PIC
3 COM2 (some models only)
4 COM1
5 LPT2/audio (if present)
6 Diskette controller
7 LPT1
8 Real-time clock
9 Video, ACPI
10 MIDI/joystick (A20 models only)
11 Available to user
12 Mouse port
13 Math coprocessor
14 Primary IDE (if present)
15 Secondary IDE (if present)
be changed to another IRQ.
DMA channel
0 8 bits
1 8 bits
2 8 bits
3 8 bits
4
5 16 bits
6 16 bits
7 16 bits
System resource
Data width
Open
Open
Diskette drive
Parallel port (for ECP or EPP)
Reserved (cascade channel)
Open
Open
Open
System resource
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