Jochen Kunz jkunz at unixag-kl.fh-kl.de
Wed Aug 11 14:59:35 CDT 2010

On Wed, 11 Aug 2010 12:45:09 -0400
Dave McGuire <mcguire at neurotica.com> wrote:

> >  I tried doing a search on google for anyone hacking these chips
> > to replace the battery but all I got were chip sales.
>   I've seen pages documenting this, but that was years ago.
I do this hack this way:
File down the top of the chip at the pin 12 / 13 end until you get to
the top of the old battery. The top of the battery is the + contact.
Now carefully carve out the wire that goes from the top down into the
resin. A dremel like tool with a small milling head will do best.
When you dug out enough of the + wire from the old battery to solder
somthing to it stop. Now cut the + wire loose at the very top of the
chip, immediately at the old battery. Solder one end of a wire to the
wire that goes down into the chip and the other end to the new battery.
Solder an other wire to pin 12 of the chip as this is GND and the other
end to - pole of the new battery.

I remember one geek meeting several years back where I did this surgery
to the NVRAMS of several Suns from my friends... Those where happy fun
days. :-)
--

\end{Jochen}

\ref{http://www.unixag-kl.fh-kl.de/~jkunz/}