Path: utzoo!attcan!uunet!cs.utexas.edu!yale!bunker!wtm
From: mbeck@rice-chex.ai.mit.edu (Mark Becker)
Newsgroups: misc.handicap
Subject: Re: TDD TO MODEM SOFTWARE
Summary: Maybe you meant Novation and Apple ][ plug in modems?
Message-ID: <14708@bunker.UUCP>
Date: 4 Oct 90 14:08:12 GMT
References: <14653@bunker.UUCP>
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Reply-To: mbeck@rice-chex.ai.mit.edu (Mark Becker)
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Index Number: 10870

In article <14653@bunker.UUCP> Bill.Higgins@p17.f122.n249.z1.fidonet.org says:
>Index Number: 10820
>
> I think that the now obsolete Hayes 300 bauder had that ability as well to
> act as a TDD system with a certain command. Write to or call Hayes and see
> if I'm right, I suspect I might be close with this one.
>

I knew there was a varient of some Novation modem that, with some
special ROM's, could handle Baudot.

I found out (the hard way) that a conventional ASCII modem will lock
to a TDD signal.. and then (if the default parameter settings are
used) disconnect when the caller let go of the keyboard.

This nearly drove me bananas when developing my TDD BBS system..
TDD callers started whomping on their keyboards before the system
discovered it was dealing with a Baudot caller.

After wrestling with the problem for awhile, I gave up.  The
documentation was changed to tell TDD callers to wait about 10-15
seconds for the TDD banner to pop up.

Regards,
Mark
mbeck@ai.mit.edu