SBC81613 Socket 370 All-in-One CPU Card Series User
’
s Manual
Hardware Description
16
4.3 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
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)
