I have an internal fax modem (pace microlin fx34) which works configured on com2 in windows 3.1. When I upgraded to win95 I am unable to configure the modem on com2, com3 or com4, the four possible configs allowed by the card.
If configured for:
com2 error is: could not open port
com3 error is: device already open (although no other programs are running)
com4 error is: hardware not available
If I reboot to windows3.1 the card works ok on com2.