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From: grr@cbmvax.commodore.com (George Robbins)
Newsgroups: comp.sys.dec
Subject: Re: modem dial in AND out possible under Ultrix?
Message-ID: <9088@cbmvax.commodore.com>
Date: 18 Dec 89 21:25:05 GMT
References: <2197@isaak.isa.de> <2844@decuac.DEC.COM> <29435@prls.UUCP>
Reply-To: grr@cbmvax.commodore.com (George Robbins)
Organization: Commodore, West Chester, PA
Lines: 27

In article <29435@prls.UUCP> gordon@prls.UUCP (Gordon Vickers) writes:
> In article <2844@decuac.DEC.COM> avolio@decuac.dec.com writes:
> ->It is very easy under ULTRIX.  Just add "shared" to the appropriate lines
> 
>     "Easy" ?  Please don't tell me that. I've been knocking my brains out
>   tring to get it to work, though I do know many Ultrix sites are using
>   'shared' mode.

This is a difficult combination.  To get shared modem support to work,
you must have to modem set up so that it doesn't assert DSR/CD when in
command/idle mode *and* then you have the problem that the DMF32 has a
hardware "feature" that prevents receiving anything unless these signals
are asserted.  This means that if you set up the modem so that it will
"share", you will have to send your modem commands "blind" i.e. no echo
of what you send the modem, no status codes...  The modemcap stuff has
some support for this blind mode, but reliability and debugging obvoiusly
suffer.

The best solution is to either write it off, or use a differnt interface
that isn't brain damaged.  A DZ11 is free and fine for 1200-2400 buad or
occasional 9600 baud use (it'll eat your cpu), DH11 emulators are also
almost free and seem to work pretty well.

-- 
George Robbins - now working for,	uucp: {uunet|pyramid|rutgers}!cbmvax!grr
but no way officially representing	arpa: cbmvax!grr@uunet.uu.net
Commodore, Engineering Department	fone: 215-431-9255 (only by moonlite)