Lenovo PC 300PL Techical Information Manual - Page 48

Appendix C. IRQ and DMA channel assignments

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Appendix C. IRQ and DMA channel assignments Appendix C. IRQ and DMA channel assignments The following figures list the interrupt request (IRQ) and direct memory access (DMA) channel assignments. Figure 38. IRQ channel assignments IRQ System resource NMI Critical system error SMI System management interrupt - power management 0 Reserved (interval timer) 1 Reserved (keyboard) 2 Reserved, cascade interrupt from slave PIC 3 COM2 3 4 COM1 3 5 LPT2/audio (if present) 6 Diskette controller 7 LPT1 3 8 Real-time clock 9 Video 10 Available to user 11 Available to user 12 Mouse port 13 Reserved (math coprocessor) 14 Primary IDE (if present) 15 Secondary IDE (if present) Figure 39. 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 3 Default, can be changed to another IRQ. 40 © Copyright IBM Corp. September 1999

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Appendix C.
IRQ and DMA channel assignments
Appendix C.
IRQ and DMA channel assignments
The following figures list the interrupt request (IRQ) and direct memory access (DMA) channel
assignments.
Figure 38. IRQ channel assignments
IRQ
System resource
NMI
Critical system error
SMI
System management interrupt — power management
0
Reserved (interval timer)
1
Reserved (keyboard)
2
Reserved, cascade interrupt from slave PIC
3
COM2
3
4
COM1
3
5
LPT2/audio (if present)
6
Diskette controller
7
LPT1
3
8
Real-time clock
9
Video
10
Available to user
11
Available to user
12
Mouse port
13
Reserved (math coprocessor)
14
Primary IDE (if present)
15
Secondary IDE (if present)
Figure 39. 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
3
Default, can be changed to another IRQ.
40
Copyright IBM Corp. September 1999