Dallas clock battery

[Chuck Guzis]

On 12/29/2005 at 5:58 PM Scott Stevens wrote:

>The method for installing a battery on a Sun NVRAM module is well
>established and can be searched.  I've done that one on numerous
>occasions.  I think the Dallas chips are laid out entirely
>differently.  Probably someone should dissect one with a dremel
>tool and write a howto somewhere.  It is a worthwhile project.
>The upper module is almost certainly sealed seperate from the
>chip itself, if it's like the Sun-type modules, there are
>contacts somewhere you can dremel in to and solder on an external
>battery lead.

I can see where digging into the clock chip for a Sun might be worthwhile
as replacements are hard to come by, but the DS1287 used in the Compaq (and
a lot of PCs) is relatively inexpensive and readily available. It's robably
not worth the trouble digging into the EDIP to find where to hook the
battery up. 

If an external battery is desired, you could just take a DS1285, which is
essentially the 1287 without the battery and hook a coin cell between pin
20 and ground.  

Cheers,
Chuck