Path: utzoo!attcan!uunet!samsung!usc!snorkelwacker!mit-eddie!bbn.com!orc!inews!iwarp.intel.com!psueea!eecs!kirkenda From: kirkenda@eecs.cs.pdx.edu (Steve Kirkendall) Newsgroups: comp.os.os9 Subject: Re: PBJ WP II under os9 Message-ID: <2949@psueea.UUCP> Date: 2 Jun 90 17:57:05 GMT References: <1990Jun1.221140.11668@cbnewsd.att.com> Sender: news@psueea.UUCP Reply-To: kirkenda@eecs.UUCP (Steve Kirkendall) Organization: Portland State University, Portland, OR Lines: 21 In article <1990Jun1.221140.11668@cbnewsd.att.com> knudsen@cbnewsd.att.com (michael.j.knudsen) writes: >>[Monitor picture moves up and down slowly] > >Russ, soundslike your Gorilla has a weak filter capacitor in its >power supply, so some 60-cycle hum is leaking into its circuits. >This is beating (heterodyning) with Coco's 60-Hz vertical frame >rate, and causing the slight drift in vertical position. > >Only fix is to replace the big electrolytic cap, or better yet add >another one in parallel with it. I doubt very much this is the >WordPack's fault. (I have one I'd love to sell cheap). There is another possibility: magnetic interference. On my Atari ST system, I have to keep my printer at least 9 inches away from my monitor, or my picture jitters like mad. I remember some other guy who had trouble because the the main power feed for his entire house went through the wall behind his computer. Try relocating some or all of your system's components. If stray magnetic fields are causing your seasick display, then this should solve it. ------------------------------------------------------------------------------- Steve Kirkendall kirkenda@cs.pdx.edu uunet!tektronix!psueea!eecs!kirkenda