Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!mit-eddie!uw-beaver!uw-june!tmccabe
From: tmccabe@cs.washington.edu (Tom McCabe)
Newsgroups: comp.sys.mac.misc
Subject: jumpy mouse pointer
Message-ID: <14264@june.cs.washington.edu>
Date: 2 Jan 91 02:50:04 GMT
Organization: U of Washington, Computer Science, Seattle
Lines: 25


My mouse pointer recently started making small, unexpected jumps
horizontally when I move it.  I've cleaned the rollers inside, changed
the mouse pad I use, checked for viruses, and can't think of any
changes to the inits I use.  Anybody seen anything like this that can
explain it to me?  Any ideas about what else to look at?

More details:  When I move the mouse around at moderate or high speeds,
everything works fine.  But when I slow down the pointer will
occasioanlly jump anywhere from 1/8th to 1/4th of an inch as I move
left and right.  The pointer never jumps vertically.  The problem is
most noticable when I try to make fine motions such as selecting a
single letter in a word processor, trying to click on the close, zoom,
or resize boxes of a window, or in drawing programs.  It seems like
sometimes the jump occurs when the mouse is not even moving, but just
after I've move it a very small amount horizontally at slow speeds.

System configuration:
IIci, 5Meg, Internal 40Mb drive, Apple Portrait display, regular
keyboard, no nubus cards.
System 6.0.5 with system heap enlarged, Multifinder and a few inits
that have worked fine for months.    

Tom McCabe
tmccabe@cs.washington.edu