IBM m41 ユーザーズマニュアル
Appendix D. Interrupt request and direct memory access
channel assignments
channel assignments
The following tables list the IRQ and DMA channel assignments.
Table 4. IRQ channel assignments
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)
Note:
The default settings for COM 1 (IRQ 4), COM 2 (IRQ 3), and LPT 1 (IRQ 7)
can be changed to another IRQ.
can be changed to another IRQ.
Table 5. DMA channel assignments
DMA channel
Data width
System resource
0
8 bits
Open
1
8 bits
Open
2
8 bits
Diskette drive
3
8 bits
Parallel port (for ECP or EPP)
4
Reserved (cascade channel)
5
16 bits
Open
6
16 bits
Open
7
16 bits
Open
© Copyright IBM Corp. 2001
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