You may have problems with this. COM3 shares the same interrupt as
COM1 and COM4 shares the same interrupt as COM2. You can get away with
this under DOS, being a single task OS (which was what it
was designed for) as long as you are careful what devices shared the
interrupt such that they never got used at the same time (e.g. two
different sorts of modems).
You *can* do this under Linux, but the performance isn't great. You
should check out the man page for "setserial", it talks at great
length about the problem and how to get around it.
Damian
> robby wrote:
>
> I need advice to make use 2 additional ports as COM3, and COM4.
> On board, 2 ports (COM1/COM2) exists already.
> Question is what utility I can possibly have, to detect the 2
> additional ports?
>
> Thanks
> robby
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