-=> ROY J. TELLASON wrote to WAYNE CHIRNSIDE <=-

 RJT> Wayne Chirnside wrote in a message to All:

 WC> Anyone know if installing a CMOS battery backwards will damage the
 WC> CMOS?

 RJT> It might.  I've known reverse-connected CMOS chips to get *real* hot.
 RJT> Sorta acts like a forward-biased diode...

 Than this I shall not try.
 Matt McCarthy  offered some good advice.
 
 WC> I installed a new battery and it STOPPED the clock despite putting
 WC> it in as indicated.

 RJT> Hmm.

Yeah that one got me as I never turned the machine off
in the interrum!

 WC> I'm thinking of reversing it from what the holder is marked
 WC> as I don't ubderstand this.

 RJT> That is pretty weird.

 WC> Clock holds fine when the machine is on with no battery.

 RJT> You may have a screwed up checksum or whatever it is that they use in
 RJT> there. There are ways to fix that,  if that's what's happening...

Likely corrosion I missed on cleaning as Matt suggested
the blasted bottom of the top contact is tough to  get to
but I've made a tool with some extreamly fine sandpaper and shall
slip that between the cell and upper  contact and follow up 
with an alcohol soaked business card to remove any residue.
Fortunately the board is mounted up the side of the case 
so any debris will not fall into anything.
 
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