Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!bu-cs!dartvax!eleazar.dartmouth.edu!stevel
From: stevel@eleazar.dartmouth.edu (Steve Ligett)
Newsgroups: comp.sys.mac
Subject: Re: Appletalk signal drivers
Message-ID: <16323@dartvax.Dartmouth.EDU>
Date: 24 Oct 89 14:55:19 GMT
References: <829@bogart.WEITEK.COM>
Sender: news@dartvax.Dartmouth.EDU
Reply-To: stevel@eleazar.dartmouth.edu (Steve Ligett)
Organization: Dartmouth College, Hanover, NH
Lines: 15

In article <829@bogart.WEITEK.COM> lupin@bogart.WEITEK.COM (Ed Lupin) writes:
...
>Also, Inside Appletalk suggests that Appletalk may be driven unipolarly,
>with +5V and 0V only.  I have my doubts.  Comments?

If you're putting in filters like Apple has in the Macs, drive it with
+/- 5 volts, otherwise you can just use +5.  The filters throw away
about half the signal.  We're using 75176's as drivers, and there's a
bunch of others to look at rather than the 26ls30.

All of this is from memory - our stuff was designed in '84.

--
Steve Ligett       steve.ligett@dartmouth.edu or
(decvax harvard linus true)!dartvax!steve.ligett