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SOM-4486 User’s Manual

Appendix B System Assignments

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

1F0-1F8

1st fixed disk

200-207

Game I/O

278-27F

Reserved

2F8-2FF

Serial port 2

300-31F

Ethernet**

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

** default setting