I/O Port Address Map - AXIOMTEK SBC82621 User Manual

SBC82621 Socket370 Half-size All-in-One CPU Card User's Manual
3.7

I/O Port Address Map

The CPU card communicates via I/O ports. It has a total of
1KB port addresses that can be assigned to other devices via
I/O expansion cards.
Address
000-01F
020-03F
040-05F
060-06F
070-07F
080-09F
0A0-0BF
0F0
0C0-0DF
0F1
0F8-0FF
120
121
122
123
1F0-1F8
200-207
300-31F
360-36F
378-37F
3B0-3BF
3C0-3CF
3D0-3DF
3F0-3F7
3F8-3FF
2F8-2FF
Hardware Description
Devices
DMA controller #1
Interrupt controller #1
Timer
Keyboard controller
Real time clock, NMI
DMA page register
Interrupt controller #2
Clear math coprocessor busy signal
DMA controller #2
Reset math coprocessor
Math processor
Disable watchdog timer operation (read)
Enable watchdog timer operation (read)
Watchdog
Board ID
Fixed disk controller
Game port
Prototype card
Reserved
Parallel port #1
MDA video card (including LPT1)
EGA card
CGA card
Floppy disk controller
Serial port #1 (COM1)
Serial port #2 (COM2)
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