Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!seismo!ll-xn!ames!oliveb!amdahl!dwl10 From: dwl10@amdahl.amdahl.com (Dave Lowrey) Newsgroups: comp.sys.cbm Subject: Re: Serial Bus Problems Message-ID: <6609@amdahl.amdahl.com> Date: Thu, 14-May-87 16:12:24 EDT Article-I.D.: amdahl.6609 Posted: Thu May 14 16:12:24 1987 Date-Received: Sat, 16-May-87 11:43:12 EDT References: <3937@ihlpa.ATT.COM> Reply-To: dwl10@amdahl.UUCP (Dave Lowrey) Organization: Amdahl Corporation, Columbia MD Lines: 43 Keywords: commodore 1541 MPS1200 In article <3937@ihlpa.ATT.COM> lew@ihlpa.ATT.COM (Lew Mammel, Jr.) writes: >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. I had the same (I think) problem with a Cardco G-Wiz interface. Turned out to be due to the power supply. I found that if I plugged the supply in an outlet who's circuit had less load on it (My house is old), everything worked fine. I don't know who's at fault, the power supply, the 64, or my house wiring! Hope this helps. -- ------------------------------------------------------------------- Dave Lowrey "So it goes, so it goes, so it goes, so it goes. But where it's going, nobody knows" [Nick Lowe] ...!{ihnp4,cbosgd,hplabs}!amdahl!dwl10 [ The opinions expressed be those of the author and not necessarily those of his most eminent employer. ]