SBC81700 VIA V4 SBC User’s Manual
Hardware Description
22
3.4 I/O Port Address Map
The VIA V4 C7/Eden CPUs can communicate via I/O ports. There are
total 1KB port addresses available for assignment 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
0C0-0DF DMA
controller
#2
0F0
Clear math coprocessor busy signal
0F1 Reset
math
coprocessor
0F8-0FF Math
processor
1F0-1F8 Fixed
disk
controller
250-25F
HR I/O
300-31F Prototype
card
380-38F SDLC
#2
3A0-3AF SDLC
#1
3B0-3BF
MDA video card (including LPT1)
3C0-3CF EGA
card
3D0-3DF CGA
card
3F8-3FF
Serial port #1 (COM1)
3E8-3EF
Serial port #3 (COM3)
2F8-2FF
Serial port #2 (COM2)
2E8-2EF
Serial port #4 (COM4)
3F0-3FF
Super I/O
Содержание SBC817
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