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From: warack@eecs.umich.edu (Christopher Warack)
Newsgroups: comp.sys.mac.system
Subject: The Saga of the Jerky Mouse
Summary: Bad Mouse
Message-ID: <1991Jun17.192542.15211@zip.eecs.umich.edu>
Date: 17 Jun 91 19:25:42 GMT
Sender: usenet@zip.eecs.umich.edu (Mr. News)
Organization: University of Michigan EECS Dept.
Lines: 23
Originator: warack@dip.eecs.umich.edu

Several people have posted about problems with their cursor jerking around
on the screen as they moved their mouse smoothly along a line either on
a pad or not.  I too had this problem:  Mac IIsi 5/80, ext keyboard, etc.
After many phone calls, the summary of what didn't work and finally did:

Clean the mouse (brand new!)             No     (Not a dirty mouse)
Switch from Sys 6.0.7 to Sys 7:          No     (Not a sys unique problem)
Replace the mouse driver (mouse file)    No     (Not a mouse file problem)
Startup with no extensions               No     (Not an init problem)
   -- Particularly After Dark (?)        No
Plug the mouse directly into the ADB
  port instead of the keyboard           No     (Not a keyboard problem)

GET A NEW MOUSE                          YES

The new mouse works just like it is supposed to (and since I'm still under
warranty -- it's free).  No one at Apple or the dealer seemed to have heard
of this problem; but, by the number of "me too"s on the net it seems to
be somewhat common.  I'd suggest that if you have this problem, to try
the hardware route before your warranty expires.

G'Luck,
Chris