Communicating between two 800xl's through j-ports

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Article #170

#170

From: Mahlen Morris
Date: Fri, 25 Apr 1986 19:50

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Howdy all, i'm kind of new to the net, so please excuse various and sundry
stupidities on my part.

Anyway, I've been trying to get my two 800xl's to talk between the joystick
ports through some simple connectors that i soldered up. The problem i'm
having is that it seems i can only reliably ground (i.e., send to zero) one
line at a time. Grounding two lines works, but is flaky; three lines, no
way. However, if i send the info to the same computer, all 4 lines can 
be grounded. Has anyone else experienced this? I have a feeling that this
has something to do with voltages and that there is zilch i can do about
it. Has anyone succeeded at inter-800 communication?

mahlen morris

(mahlen@brahms) at Berkeley (what should this message be)?

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Message-ID: <13409@ucbvax.BERKELEY.EDU>

Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!burl!ulysses!ucbvax!brahms!mahlen

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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.3 4.3bsd-beta 6/6/85; site ucbvax.BERKELEY.EDU
Path: arc1-ca.pugleaf.net!utzoo!watmath!clyde!burl!ulysses!ucbvax!brahms!mahlen
From: mahlen@brahms.BERKELEY.EDU (Mahlen Morris)
Newsgroups: net.micro.atari8
Subject: Communicating between two 800xl's through j-ports
Message-ID: <13409@ucbvax.BERKELEY.EDU>
Date: Fri, 25-Apr-86 15:50:00 EDT
Article-I.D.: ucbvax.13409
Posted: Fri Apr 25 15:50:00 1986
Date-Received: Sun, 27-Apr-86 06:08:10 EDT
Sender: usenet@ucbvax.BERKELEY.EDU
Reply-To: mahlen@brahms.UUCP (Mahlen Morris)
Organization: University of California, Berkeley
Lines: 16