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24 SOM-4450 User's Manual
B.1 System I/O ports
Table B-1: System I/O ports
Addr. range
(Hex) Device
000-01F DMA controller (slave)
020-03F Interrupt controller 1, (master)
040-05F 8254 timer/counter
060-06F 8042 (keyboard controller)
070-07F Real-time clock, non-maskable interrupt (NMI)
mask
080-09F DMA page register,
0A0-0BF Interrupt controller 2 (slave)
0C0-0DF DMA controller (master)
0F0 Clear math co-processor
0F1 Reset math co-processor
0F8-0FF Math co-processor
170- 178 2nd fixed disk for CompactFlash
1F0-1F8 1st fixed disk
200-207 Game I/O
278-27F Reserved
2F8-2FF Serial port 2
300-31F Ethernet**
360-36F LPT2
378-37F Parallel printer port 1 (LPT1)
380-38F SDLC, bisynchronous 2
3A0-3AF Bisynchronous 1
3B0-3BF Monochrome display
3C0-3CF Reserved
3D0-3DF Color/graphics monitor adapter
3F0-3F7 Diskette controller
3F8-3FF Serial port 1
443 Watchdog timer
** default setting