Lenovo PC 300PL Technical Information Manual 6275, 6285 - Page 80

Appendix C. IRQ and DMA Channel Assignments, IRQ 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 51. IRQ Channel Assignments IRQ System Resource NMI I/O channel check 0 Reserved (interval timer) 1 Reserved (keyboard) 2 Reserved (cascade interrupt from slave) 3 COM2 4 4 COM1 4 5 LPT2/Audio (if present) 6 Diskette controller 7 LPT1 4 8 Real-time clock 9 Available to user 10 Available to user 11 Windows sound system (if present) 12 Mouse port 13 Reserved (math coprocessor) 14 Primary IDE (if present) 15 Secondary IDE (if present) Figure 52. DMA Channel Assignments DMA Channel Data Width 0 8- or 16- bits 1 8- or 16- bits 2 8- or 16- bits 3 8- or 16- bits 4 - 5 16 bits 6 16 bits 7 16 bits System Resource Open Parallel port Diskette drive Parallel port (for ECP or EPP) Reserved (cascade channel) Open Open Open 4 Default, can be changed to another IRQ. 68 Copyright IBM Corp. June 1998

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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 51. IRQ Channel Assignments
IRQ
System Resource
NMI
I/O channel check
0
Reserved (interval timer)
1
Reserved (keyboard)
2
Reserved (cascade interrupt from slave)
3
COM2
4
4
COM1
4
5
LPT2/Audio (if present)
6
Diskette controller
7
LPT1
4
8
Real-time clock
9
Available to user
10
Available to user
11
Windows sound system (if present)
12
Mouse port
13
Reserved (math coprocessor)
14
Primary IDE (if present)
15
Secondary IDE (if present)
Figure 52. DMA Channel Assignments
DMA Channel
Data Width
System Resource
0
8- or 16- bits
Open
1
8- or 16- bits
Parallel port
2
8- or 16- bits
Diskette drive
3
8- or 16- bits
Parallel port (for ECP or EPP)
4
–
Reserved (cascade channel)
5
16 bits
Open
6
16 bits
Open
7
16 bits
Open
4
Default, can be changed to another IRQ.
68
Copyright IBM Corp. June 1998