14 Oct
2006
14 Oct
'06
6:49 p.m.
----- Original Message -----
From: "Chuck Guzis" <cclist at sydex.com>
To: <cctalk at classiccmp.org>
Sent: Saturday, October 14, 2006 9:36 PM
Subject: Re: 486 EISA system
On 10/14/2006 at 8:22 PM Teo Zenios wrote:
in
Anyway the 2 battery parts on the motherboard are:
Dallas
DS1225Y-200 and ST micro MK48T87B-24. Is there a link to the discussion
(or
website) on how to rig a lithium coin battery to
this particular part? I
have a dremel, battery holder, and plenty of batteries so this should be
easy enough. Can the ST Time keeper RAM) chip also be rigged in this way
(is it the same part as the DS1287 mentioned above)?
The ST product is a drop-in replacement for the DS1287, and I suspect the
location of the battery and crystal is the same as the Dallas part.
Here are details on rigging an external battery for the 1287
http://www.mcamafia.de/mcapage0/dsrework.htm
As far as the DS1225, I don't know exactly where in the potting resin the
battery is located--and I can't seem to locate any online information that
would give a clue. You could always dig around and see if the battery's the middle of the package, as it is in the 1287, but
no guarantees. About
10 years ago, RAMTRON published an app note that pretty much said that you
could replace the DS1225 with their FM1608 part--I don't recall any
specific gotchas.
Hope this helps,
Chuck
The ST chip is 2 layers that connect at the ends (seems to be some potting
there), I wonder if the battery is on the top player or the bottom. I hope
there is enough residual voltage for a meter to read so I know which half I
need to disconnect.
Nothing on the 1225Y then other then finding a replacement?