5 Jan
2015
5 Jan
'15
9:43 a.m.
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Richard
Loken
Sent: 05 January 2015 16:19
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Understanding DECsystem 5100 Self Test Failure
On Sun, 4 Jan 2015, Robert Jarratt wrote:
can
When I power up my DECsystem 5100 I get the
output shown at the end of
this email. I thought this was to do with the DS1287 chip as it seems
be an NVRAM battery error (perhaps). Since I know these devices fail I
took out the DS1287, put in a socket and then bought a replacement
DS12887A. But I still get the same problem. It could be that I bought
a bad replacement, or that I
I hope you did not throw out the old one. Assuming the new one is not
compatible with you system or the battery in the new one is also dead, you find a set of instructions on the internet to drill a
couple appropriate
holes in
the DS1297 to disconnect the internal battery and
attach an external
battery.
I have kept the original, but I am not sure that it was faulty in the first
place. I think the fault is something else, but I am not sure what. I did
find some pages on how to "repair" one, but I would rather be sure it is
faulty now before trying to do anything to it. For the record the RTC
self-test passes successfully.
Regards
Rob
I have the link some where if you cannot find it.
I have an Alphaserver 4100 (running VMS) within arm's reach that is turned
off
because of a dead DS1287, I have the parts but I have
not found the time
to do
the repair. This conversation reminds me that I have
put that off for too
long.
I would consider at least taking out the old one and soldering in a socket
so that if necessary it is easy to replace.
Regards
Rob