How to get uPort to recognize COM3 & COM4.

[Paul Raulerson]

I need to know how to get uPort to recognize COM3 &4 without 
purchasing an intelligent communications card. I tried the simple
expeidient of telling ttypatch to create com3, with the interrupt 
structure as so:
			IRQ=4, BASE=3e8H 
which DOS recognized right away, but uPort choked on.  I assume 
by this failure I have to play games with the kernal, or more
specifically with the asy driver in the kernal.  I looked in the
dfile.wini configuration file and found that the max number of
serial ports supported was 4, but am at a loss what else to change
to make things happy.  The line printer seems to have three vectors,
while the asy driver seems to have only 2, should I "steal" one of the
unused line printer vectors?  

Any input/help would be much appreciated!  

Thanks
 


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