29 Dec
2005
29 Dec
'05
3:39 p.m.
Chuck Guzis wrote:
On 12/29/2005 at 5:58 PM Scott Stevens wrote:
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
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.