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   Message 159 of 190
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   Re: 1351 mouse trouble on C128DCR  more options
   
   
   Author:   Greg King
   Email: gngking@erols.com
   Date: 1998/12/30
   Forums: comp.sys.cbm
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   _________________________________________________________________
   
arca93@delphi.com wrote:
> Robin Harbron <macbeth@tbaytel.net> writes:
> > Hey -- 2 weeks ago, my mouse pointer would not move
> > left or right, anymore.  I tested it with a bunch of
> > software, and eventually came to the realization that
> > something was wrong with the computer.
> >
> > I know enough to guess that probably something had
> > gone in my SID -- so I swapped it with another SID
> > I had (out of a 64C, I think), and things started
> > working again.
>
> Robin,
> It's probably not the computer.  Most likely, your problem is
> a broken wire in the mouse.  They tend to break right near the
> area where the wires enter the mouse.  It's an easy fix.
> Try a different mouse first, to verify this.  If the second
> mouse works, then it's your mouse.
> I've got one that goes only up and down.  It's SmartMouse #1,
> but I've been too lazy (or with inadequate time) to fix it, yet.
> -Maurice

There is also a possibility that the problem is at the other end
of the cable:

1. Maybe, a wire broke where the cable
   goes into the nine-pin "socket."

2. But more likely, it's a problem with the computer's "plug."
   Plugging/unplugging puts a lot of stress on those plugs
   and their connection to the computer's motherboard.  After awhile,
   the solder joints might work loose.  Sometimes, "jiggling"
   or tapping the socket (while it's plugged in),
   or doing other things such as moving the case,
   can "rejoin" those contacts, but heating/cooling and vibration
   eventually will "break" them, again.  The pins which come out
   of the back of the plug must be resolderred to the motherboard
   (both sides of the board, I assume).

1351-style mice convey their position through high-frequency PWM
(Pulse-Width Modulation) which must be syncronized between the SID
and the mouse.  Therefore, it's much more vunerable
to lousy connections than are buttons and joysticks.
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