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From: lew@ihlpa.UUCP
Newsgroups: comp.sys.cbm
Subject: Serial Bus Problems
Message-ID: <3937@ihlpa.ATT.COM>
Date: Thu, 14-May-87 13:04:41 EDT
Article-I.D.: ihlpa.3937
Posted: Thu May 14 13:04:41 1987
Date-Received: Sat, 16-May-87 09:48:17 EDT
Organization: AT&T Bell Laboratories - Naperville, Illinois
Lines: 22
Keywords: commodore 1541 MPS1200

I recently purchased a MPS1200 printer for my Commodore 64. When it's
hooked up in series with the 1541 disk drive there seems to be interference
between the 1541 and the MPS1200.

First of all, with the printer powered up I have problems with disk access.
When downloading Printshop(TM) I get a "Disk Drive not available" message.
If I turn off the printer this doesn't happen, so I can make my signs and
greeting cards by powering up the printer at strategic moments. ( I have an
excuse: I have kids :-)

Secondly, with both devices on the BASIC command PRINT#1,A$ succeeds
intermittently. This command is in a little microeditor ( a line echo
program ) that I wrote to play with the printer. If I power off the
disk drive there's no problem.

All the equipment is plugged into a grounded multi-plug outlet.

Of course, none of the literature I have contains any suggestion that
these devices could interfere in this way. Does anybody have any advice
on how to diagnose or correct these problems? Thanks.

Lew Mammel, Jr.