Cliff Mark wrote:
>
> Hello,
>
> ISomeone I know is having problems allocating Com ports as follows:
>
> Com port 1 - Mouse
> Com port 2 - Used for external "Ham Radio" device
> Com port 3 - internal modem.
>
> Needless to say the internal modem doesn't work.
> I thought you could only have/use  2 Com ports at a time? but he insists
> that it should be possible.
>

He is right, BUT... he needs to reverse the COM 2 and COM 3 uses or
reverse the COM 1 and COM 2 uses.

All four comm ports can be used but not at the same time.
Comm ports 1&3 -OR- ports 2&4 can not be used at the SAME TIME because
they share a common IRQ.  You CAN use com 1&2 at the same time and
you can use com 3&4 at the same time.

--
Jim Meagher
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Micro Solutions Consulting        Web Design, Network Administration
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