Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!mcvax!hafro!krafla!rispa2!orn
From: orn@rsp.is (Orn E. Hansen)
Newsgroups: comp.sys.ibm.pc
Subject: Re: MSWindows and Modems.
Summary: Probably an Interrupt conflict
Message-ID: <115@.rsp.is>
Date: 7 Apr 89 21:36:20 GMT
References: <111700056@uxa.cso.uiuc.edu>
Organization: National Hospital of Iceland
Lines: 11
Keywords:

In article <111700056@uxa.cso.uiuc.edu>, rra90329@uxa.cso.uiuc.edu writes:
>
> I'm running Windows 2.01, a Logitech 3-button serial ouse, and the Telix
> shareware telecom program with a Zuckerboard 1200 baud modem. Windows works with
> the mouse set as COM1 (the only choice with mt stupid serial board). The modem
> works fine set as COM3, but not as COM2.?!
>
My guess is that you are experiencing a conflict of interrupts between COM1
and COM2.  The external serial board may address it's COM port as COM2, but
might use the interrupt vector for COM1!.  The IRQ line for COM2 is IRQ 3
and IRQ 4 for COM1.