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Re: Sudden instability: can a faulty mouse cause this?

On Wed, 15 Nov 2000, Johann Spies wrote:
> On Wed, Nov 15, 2000 at 10:19:11AM -0200, Henrique M Holschuh wrote:
> > On Wed, 15 Nov 2000, Johann Spies wrote:
> > > I have a ps/2 mouse which I have used without problems for about a
> > > year now.  Can a hardware problem on the mouse or the ps/2 port cause
> > > this?  How can I determine the cause?
> > I assume you don't have a multimeter readly available to simply test the
> > ports and mouse.
> I have a multimeter but do not know how to test the ports and the
> mouse.  Is there documentation somewhere?

I think you can find the PS/2 mouse pinout doing a search in www.google.com.
The hardware repair FAQ (use google to find it, it might be named
'electronics repair faq', or something like that -- I don't recall) should
be of help as well, I suppose.

To look for shorted circuits, you just need to use the ohmimeter function
and look for low resistance (anything lower than 1k is suspicious ;-) )
between different wires that should be isulated from each other (such as TX
and RX in a serial port -- the PS/2 pinout will help you).

I think the multimeter's probe current for resistance measurement is not
likely to damage the mouse, but I cannot be sure; you have been warned.

BTW: this test is not failure-proof. It won't detect if your mouse is
draining just a bit more current than the PS/2 specs allow for, either.

I don't recommend you test the ports with a multimeter.

  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

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