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From: generous@dgis.UUCP
Newsgroups: comp.unix.wizards
Subject: Re: DTR Problems
Message-ID: <205@dgis.UUCP>
Date: Sat, 28-Feb-87 10:08:51 EST
Article-I.D.: dgis.205
Posted: Sat Feb 28 10:08:51 1987
Date-Received: Sun, 1-Mar-87 13:31:36 EST
References: <1995@emory.UUCP> <2603@phri.UUCP>
Reply-To: generous@dgis.UUCP (Curtis Generous)
Organization: Defense Gateway Info. System, Alexandria, VA
Lines: 43
Keywords: DTR getty dh dz

In article <2603@phri.UUCP> roy@phri.UUCP (Roy Smith) writes:
>In article <1995@emory.UUCP> km@emory.UUCP writes:
>> We have been having the following problem on 4.3BSD (acutally the
>> Mt Xinu release) [...] Getty does not always raise DTR on its port.
>
>	For some more conventional suggestions, check the dmf flags in your
>config file to make sure modem control is {en,dis}abled on the right lines
> ...
>you're using a mix of Emulex CS-21's and DEC DMF-32's, remember that only
>the first two lines on the DEC board have modem control, and that while all
>the Emulex lines do, it doesn't quite match that on the DEC board.
>

About 16 months ago, I ran into the same problem that km@emory had with
the modem control signals on a DEC DMF-32, under More/bsd (Mt. Xinu's 4.2 bsd),
running on a 11/750.
I eventually discovered the same two remedies that roy@phri mentions:

     1) you need the proper flags set in your /sys/conf/HOST file
	 (and then make sure you run config, make depend, make ... :-)
     2) make sure that you only use the first 2 ports

But I also discovered one more thing was needed to get the ports to work:

     3) You needed to use a program called "/etc/ttyconfig".
	This is a Mt Xinu's unique program? (as far as I know), and 
	it allowed the control some on those signals.  I am telling this
	all from memory, as I don't have access to this host anymore.
	I also remeber having a hard time finding any info on "ttyconfig",
	as there wasn't a man page available.  (Maybe Ed Gould can tell
	us more about it?)

By the way, the version of the DMF-32 driver that we had from Mt. Xinu
also supported the parallel port (we had a printer attacher to it).  
Has any one out there written a driver to also support the synchronous port?
Hope this helps:

-curtis-
======================================
Curtis C. Generous
Lawrence Livermore National Labs
ARPA: generous@lll-tis-b.ARPA
UUCP: {seismo,vrdxhq}!dgis!generous