Dallas clock battery

[Doc Shipley]

Chuck Guzis wrote:
> 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.  

   Except the DS1285 is nearly as expensive as a DS12887....  I picked 
up a DS12887 from Maxim (nee Dallas) for $6 + S&H.

   Thanks for the pointers, y'all.  I don't really collect PCs, but that 
SLT/286 has some sentimental significance.  It's worth a couple of bucks 
and some solder time.

ObFunny:
   When I was looking around at prices, I did find a site selling DS1287 
modules.  *Used* DS1287 modules.


	Doc