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From: warack@aero.ARPA (Chris Warack)
Newsgroups: net.micro.mac
Subject: Communication problems ...
Message-ID: <393@aero.ARPA>
Date: Thu, 22-Aug-85 18:50:26 EDT
Article-I.D.: aero.393
Posted: Thu Aug 22 18:50:26 1985
Date-Received: Sun, 25-Aug-85 13:49:15 EDT
Reply-To: warack@aero.UUCP (Chris Warack)
Organization: The Discordian Society
Lines: 41
Summary: Nobody listens to my Mac ...

[ouch]
I have been trying to hook my Mac up to various modems and computers for
a while now.  I have been totally unsuccessful.

Today I was able to use some diagnostic tools and try to narrow down the
problem.  It seems that the Mac's signals are too weak to be listened to
by other computers!  Has anyone else had this problem???

I am trying hardwire connections using a printer cable [w and without
Apple's modem eliminator].  I know other people who have used their
printer cables to connect both with and without modems.  I have tried
both ports and I'm using MacTerminal.  [Though I also tried MacKermit
and Red Ryder briefly to see if that helped -- it didn't].

Finally after hooking up the Mac to a breakout box and comparing it to a
normal terminal [HP 2621] I noticed that the LED's showing the signals
for the Mac were awfully dim.  In fact, Terminal Ready would sometimes
disappear when the computer end was connected.  I later surmised that it
was being pulled-down by the computer.

Next, I tried jump-starting the connection by substituting full-strength
signals for Terminal Ready [pin20] and [pin4].  The computer responded
like it was ready.  But, it still wasn't picking up transmitted data
[pin2].  I could see the light when data was sent, but the computer
never responded.  Again, the light was also dim.

Am I correct in thinking there is something wrong with the power level
of my comm ports?  or am I doing something else wrong?  I'd like to hear
any other 'war stories' or advice before I take it in for servicing.

Thanks,
Chris
-- 
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