19 May
2001
19 May
'01
1:27 p.m.
I downloaded the datasheet for the 48t02's, i think i may have a handful of
32.768 xtals here so I'm looking ar chopping the tops off the bad chips I
have and taking protoboard and refitting them with a new xtal and
batteryholder package that can take a replacable lithium cell. :) I
sacrificed one yesterday to the great dremel in the sky to see how the top
was put together...
At 02:48 PM 5/19/01 -0700, you wrote:
On Fri, 18 May 2001, Richard Erlacher wrote:
Maybe the SmartSocket isn't what I wanted.
Somewhere in the "pit" I've
got a
Dallas socket that has a 3-volt battery in the
bottom. It's potted in
place but
provides 3 volts on pin 24, (maybe pin 28, but
the upper left corner,
anyway) in
this case and does nothing but provide power to
keep the content of the
resident
IC intact, and, maybe, gate the write signal off
until the power is
stabile. I
do believe there's no continuity between the
write pin on the resident
IC and
the corresponding socket pin, so something's
going on. That sort of device
might work, don't you think? Next time I'm at the Dallas web site I'll
try to
find the socket and let you know what the
appropriate nomeclature is.
Dick
There is/was a Dallas SmartClock(?) that contained a battery for the
internal clock/calendar and also carried a 28-pin socket atop the
package. I don't believe that battery voltage was provided to the
socket though. Ampro used them in their LittleBoard/PC.
- don
----- Original Message -----
From: "Pete Turnbull" <pete(a)dunnington.u-net.com>
To: <classiccmp(a)classiccmp.org>
Sent: Friday, May 18, 2001 1:43 AM
Subject: Re: Slicing open the top of a 48T02 Sun Sparc chip to replace
battery
is that thing hollow or filled with epoxy?
> On May 17, 19:34, Richard Erlacher wrote:
>
> > Has anybody tried one of the DALLAS "smart socket" products with
this
> thingie?
>
> Unfortunately the 48T02 is a TOD clock and calendar as well as NVRAM, so
> there's no suitable SmartSocket to replace it. The registers have to
be
at
> > particular places and use a particular protocol too.
> >
> >
> >
> > --
> > Pete Peter Turnbull
> > Network Manager
> > University of York
> >
> >
>
>