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 Devices
000-01F
DMA controller #1
020-03F
Interrupt controller #1
040-05F
Timer
060-06F
Keyboard controller
070-07F
Real time clock, NMI
080-09F
DMA page register
0A0-0BF
Interrupt controller #2
0F0
Clear math coprocessor busy signal
0C0-0DF
DMA controller #2
0F1
Reset math coprocessor
0F8-0FF
Math processor
120
Disable watchdog timer operation (read)
121
Enable watchdog timer operation (read)
122
Watchdog
123
Board ID
1F0-1F8
Fixed disk controller
200-207
Game port
300-31F
Prototype card
360-36F
Reserved
378-37F
Parallel port #1
3B0-3BF
MDA video card (including LPT1)
3C0-3CF
EGA card
3D0-3DF
CGA card
3F0-3F7
Floppy disk controller
3F8-3FF
Serial port #1 (COM1)
2F8-2FF
Serial port #2 (COM2)
Hardware Description
27
To Next Page
Loading...
