Lenovo NetVista Technical information manual for NetVista 6269, 6568, 6569, 65 - Page 59

Appendix C. IRQ and DMA channel assignments, The default settings for COM 1 IRQ 4, COM 2 IRQ 3 - full width keyboard

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Appendix C. IRQ and DMA channel assignments The following figures list the IRQ and DMA channel assignments. Table 35. 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 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) Note: The default settings for COM 1 (IRQ 4), COM 2 (IRQ 3), and LPT 1 (IRQ 7) can be changed to another IRQ. Table 36. DMA channel assignments DMA channel 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 © Copyright IBM Corp. 2000 49

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© Copyright IBM Corp.
2000
49
Appendix C.
IRQ and DMA channel assignments
The following figures 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) can
be changed to another IRQ.
Table 35. 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
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)
Table 36. 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