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Appendix B System Assignments
B.1 System I/O ports
Table B-1: System I/O ports
Addr. range
(Hex)
000-01F DMA controller (slave)
020-03F
040-05F
060-06F
070-07F
080-09F
0A0-0BF
0C0-0DF
0F0
0F1
0F8-0FF
1F0-1F8
200-207
278-27F
2F8-2FF
300-31F
360-36F
378-37F
380-38F
3A0-3AF
3B0-3BF
3C0-3CF
3D0-3DF
3F0-3F7
3F8-3FF
443
SOM-4475 User's Manual
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Device
Interrupt controller 1, (master)
8254 timer/counter
8042 (keyboard controller)
Real-time clock, non-maskable interrupt (NMI)
mask
DMA page register,
Interrupt controller 2 (slave)
DMA controller (master)
Clear math co-processor
Reset math co-processor
Math co-processor
1st fixed disk
Game I/O
Reserved
Serial port 2
Ethernet**
LPT2
Parallel printer port 1 (LPT1)
SDLC, bisynchronous 2
Bisynchronous 1
Monochrome display
Reserved
Color/graphics monitor adapter
Diskette controller
Serial port 1
Watchdog timer
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