I read the question in a slightly different way: is it possible to
multiplex (a) the the Programmer´s serial I/O and (b) the User uart I/O
to a single PC com port?
As far as I know it is not possible in a standard way to simultaneously
link both channels to a single com port.
If you have a desktop with COM0 and COM1 ports, you can connect your
programmer to one and the user I/O to the other (and start on one your
studio/avrdude session and on the other a hyperterminal/minicom session).
In case you just have one com port, you might possibly be able to create
an additional one using a pcmcia card - I have seen that there exist
(quite expensive) pcmcia-to-comport cards, but I never had a close look
at this kind of device.
Have you considered to get hold of a no more used laptop or PC (maybe
you find one with a bad battery, too slow CPU, too little memory ... -
hyperterminal or minicom do not need much resources) and use it just
like a plain old terminal?
Cheers, Juergen
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