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Path: utzoo!watmath!clyde!burl!ulysses!allegra!mit-eddie!think!harvard!seismo!mcvax!boring!jack
From: jack@boring.UUCP
Newsgroups: net.dcom
Subject: Re: autodial on synchronous modems
Message-ID: <6483@boring.UUCP>
Date: Fri, 28-Jun-85 13:00:30 EDT
Article-I.D.: boring.6483
Posted: Fri Jun 28 13:00:30 1985
Date-Received: Sun, 30-Jun-85 00:20:06 EDT
References: <413@enmasse.UUCP>
Reply-To: jack@boring.UUCP (Jack Jansen)
Distribution: net
Organization: AMOEBA project, CWI, Amsterdam
Lines: 23
Apparently-To: rnews@mcvax.LOCAL


[Re: dialing by sending pulses to a certain pin on a modem]

That's an old trick. What this in fact does is opening and closing
the line fast (using DTR), since this is the same as the dial
does.

For anyone who is interested: I have a PDP-11 DL-11E driver that
uses this trick to do dial-out on one of those pre-historic ASR-33
modems on machine 'htsa'. The driver is also intelligent about
incoming and outgoing calls (which it can both handle).

I haven't done any statistics, but the driver seems to get the
correct number almost all the time (I never caught it dialing the
wrong number, at 3 o'clock at night:-).

If anyone is interested in the code (for V7 PDP-11, although it
will probably port with adaptions for your device), I'll try to
dig it cleanly out of the tty driver.

-- 
	Jack Jansen, jack@mcvax.UUCP
	The shell is my oyster.