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internal modem/com port problems

Posted on 1997-02-22
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Last Modified: 2013-12-16
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.

Any ideas?
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Question by:comp12
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navigator010897 earned 100 total points
ID: 1744040
Windows 3.1 is more tollerant of two things sitting on the same port then Win95, also a modem has to be properly set.  Here's the sequence I would go through if I went to a client with modem problems:

1) Check to see if the modem has been "installed" in Win95, if it hasn't, go to START - SETTINGS - CONTROL PANEL - ADD/REMOVE HARDWARE and let the computer search for the modem.

If that didn't solve the problem:

2) Deactivate the second default com port in your computer.  This will mean (on a system with a I/O board) openning up the system, pulling out the board and following the directions to set the jumper to deactivate the port.

If that doesn't work (which it should)

3) By default, Com1 and Com3 are linked and Com2/Com4 are linked.  If you want to put a card on Com3 or Com4, you are going to need to make sure that it is using a different Interrupt and different DMA address then Com1 or Com2, if you don't, it'll never work quite right.  

All of this shouldn't be too hard to do, you will need (on a newer pentium system) your Mainboard or motherboard manual, (on an older system) your I/O controller manual (most of the time this manual is also the Harddrive/floppy controller), and your modem manual.  Once resetting everything, reboot windows95, go to START - SETTINGS - CONTROL PANEL - ADD/REMOVE hardware, let it search for the modem and install it.
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