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From: stevew@en.ecn.purdue.edu (Steven L Wootton)
Newsgroups: comp.windows.ms
Subject: Re: Comm trouble: Win + DOV unit
Summary: Problem solved, I think.
Message-ID: <1991Apr23.190225.7173@en.ecn.purdue.edu>
Date: 23 Apr 91 19:02:25 GMT
Article-I.D.: en.1991Apr23.190225.7173
References: <1991Apr21.102731.19232@en.ecn.purdue.edu> <6553@bwdls58.bnr.ca> <11332@uwm.edu>
Organization: Purdue University Engineering Computer Network
Lines: 38


If there's a RAQ (Rarely Asked Question) file somewhere, this topic might
be worth it. :-)  Apparently, Windows gets really unhappy about a couple of
serial signals.  Or maybe my COM ports do, but only under Windows.

In article <11332@uwm.edu> aragorn@csd4.csd.uwm.edu (Steve J White) writes:
>In article <6553@bwdls58.bnr.ca> mlord@bwdls58.bnr.ca (Mark Lord) writes:
>>In article <1991Apr21.102731.19232@en.ecn.purdue.edu> stevew@en.ecn.purdue.edu (Steven L Wootton) writes:
>>...
>><
>><I pulled my I/O card and put in a 1200 bps Hayes compatible internal modem,
>><and all of the Windows apps work.  Put the I/O card back in and attach the
>><cable to the Gandalf, and everything stops again.
>>
>>Hmm.. almost as if there were a steady flow of interrupts (or a stuck interrupt)
>>in/under windows...
>
>Second, and MORE likely, is that the port card you are using is somehow
>tying up the COM port that you want to use for the DOV unit.

And this would not affect the port under DOS?  Interesting.  The DOV unit
works well on my machine under DOS, and has for years.  I don't *think* the
COM ports had much to do with the problem, but they may have.

>Let us know what happens.

Well, I'm not sure HOW this solved the problem, but it did.  According to
the Gandalf DOV manual, some systems may have trouble with the SCT and SCR
signals coming from the DOV unit.  They note that this would be "an
exceptional case," and that the system seller would note if these signals
would cause a problem.

I had tried pretty much everything else, so I flipped the dip switch to
suppress SCT and SCR.  Terminal (and QVT, and WinKermit) started working
perfectly with the DOV, at 9600bps.  I have no idea what SCT and SCR are
for or what they do, but I'd be interested in hearing about them.

Steve Wootton