Appendix D. Interrupt Request And Direct Memory Access Channel Assignments - IBM NetVista User Manual
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Appendix D. Interrupt request and direct memory access
channel assignments
The following tables list the IRQ and DMA channel assignments.
Note: The default settings for COM 1 (IRQ 4), COM 2 (IRQ 3), and LPT 1 (IRQ 7)
© Copyright IBM Corp. 2002
Table 4. IRQ channel assignment
IRQ
System resource
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
Available to user
6
Diskette controller
7
LPT1
8
Real-time clock
9
Video, ACPI
10
Available to user
11
Available to user
12
Mouse port
13
Math coprocessor
14
Primary IDE (if present)
15
Secondary IDE (if present)
can be changed to another IRQ.
Table 5. DMA channel assignments
DMA
Data width
0
8 bits
1
8 bits
2
8 bits
3
8 bits
4
5
16 bits
6
16 bits
7
16 bits
System resource
Open
Open
Diskette drive
Parallel port (for ECP or EPP)
Reserved (cascade channel)
Open
Open
Open
95
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