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101 Appendix B
B.16 System I/O Ports
Table B.16: System I/O ports
Addr. Range (HEX) Device
020 021 Programmable interrupt controller
040 043 System timer
060 Standard 101/102 key or Microsoft Natural PS/2
061 System speaker
064 064 Standard 101/102 key or Microsoft Natural PS/2
070 073 System CMOS/real time clok
080 090 Direct memory access controller
094 09F Direct memory access controller
0A0 0A1 Programmable interrupt controller
0C0 0DF Direct memory access controller
0F0 0FF Numeric data processor
170 177 Secondary IDE channel
1F0 1F7 Primary IDE channel
2F8 2FF Communication port (COM2)
376 Secondary IDE channel
3F6 Primary IDE channel
378 37F Printer port (LTP1)
3F8 3FF Communication port(COM1)
444 Watchdog Timer
B.17 DMA Channel Assignments
Table B.17: DMA channel assignments
Channel Function
0 Available
1 Available
2 Floppy disk (8-bit transfer)
3 Available
4 Cascade for DMA controller 1
5 Available
6 Available
7 Available