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Article #1654Re: HELP! 520ST parallel printer port doubles characters?
From: Grant Bonnell
Date: Thu, 28 Aug 1986 13:38
Date: Thu, 28 Aug 1986 13:38
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1793 bytes
In article <1310@watdragon.UUCP> you write: >I just bought a db25->centronics connector to hook up my ST to an old >Seikosha GP-100A printer >Unfortunately, characters sent from the ST arrive ddoouubblleedd at the >printer. I have also experienced this problem and determined that it was due to a difference in potential between the ground at the connector of the atari and that of the printer. This causes noise on the signal lines and produces the effect you mention. A temporary solution is to ensure that one of the two cable ends is NOT connected to the chasis ground. This problem may stem from the fact that your equipment is not properly grounded. Are you certain that the outlets into which your equipment is plugged are grounded? For example in my house (built about 30 years ago) I discovered that even though the wall sockets were the grounded type (presumably installed by some previous owner) the ground screw was not connected to anything, since the house was wired with only two conductor cable. I hope this helps. Grant Bonnell !philabs!micomvax!othervax!z-80
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Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: arc1-ca.pugleaf.net!utzoo!mnetor!seismo!lll-crg!nike!sri-spam!parcvax!hplabs!pyramid!decwrl!amdcad!amdimage!prls!philabs!micomvax!othervax!z-80 From: z-80@othervax.UUCP (Grant Bonnell) Newsgroups: net.micro.atari16 Subject: Re: HELP! 520ST parallel printer port doubles characters? Message-ID: <810@othervax.UUCP> Date: Thu, 28-Aug-86 09:38:08 EDT Article-I.D.: othervax.810 Posted: Thu Aug 28 09:38:08 1986 Date-Received: Sat, 30-Aug-86 03:12:23 EDT References: <1310@watdragon.UUCP> Reply-To: z-80@othervax.UUCP (Grant Bonnell) Distribution: net Organization: Philips Information Systems - St. Laurent P.Q., Canada Lines: 21