Path: utzoo!attcan!uunet!jarthur!usc!rutgers!netnews.upenn.edu!dsl.cis.upenn.edu!touch
From: touch@dsl.cis.upenn.edu (Joe Touch)
Newsgroups: comp.sys.mac.hardware
Subject: mac serial questions - CHIP BAD!!!
Message-ID: <26690@netnews.upenn.edu>
Date: 3 Jul 90 23:51:52 GMT
Sender: news@netnews.upenn.edu
Reply-To: touch@dsl.cis.upenn.edu (Joe Touch)
Organization: University of Pennsylvania
Lines: 18

OK, Folks, here's what I found out...

I tried the same tests with the printer port, and got
different answers (I had the wires bound under the table,
and couln't quite get to them until now...)

That port is working AOK - the modem-to mac info 
	WAS	(modem port)	-2.2 V / 21mA
	IS	(printer port)	-7.5 V / 0.5mA

NOW
	any suggestions what chip to replace (it's
a MacPlus)?  I figured the modem is OK driving that much current,
but I'd rather not let it be...

	Thanks everybody for your help.

	Joe