Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!tut.cis.ohio-state.edu!ucbvax!pro-generic.cts.com!sb
From: sb@pro-generic.cts.com (Stephen Brown)
Newsgroups: comp.sys.apple
Subject: Re: Videx Videoterm Softswitch board
Message-ID: <8832.infoapple.net@pro-generic>
Date: 5 Jan 90 06:56:31 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 16

In-Reply-To: message from ianj@sactoh0.UUCP

Ian R. Justman asks which chip the Videx softswitch daughterboard piggy-backs.

The softswitches I have seen all piggy-back the 74LS259 (could also be a 9334)
which is located at F14 on a II+. I believe it watches the conditions of
annunciators 2 and 3, which the Videx firmware play with. Watch the polarity
of the chip and the daughterboard when you install it, and make sure it's in
ALL the way.

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