HP3000-L Archives

October 2007, Week 4

HP3000-L@RAVEN.UTC.EDU

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Subject:
From:
Stan Sieler <[log in to unmask]>
Reply To:
Stan Sieler <[log in to unmask]>
Date:
Tue, 23 Oct 2007 14:29:05 -0700
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Re:

> try to change the cmos battery
>> Yesterday I powered up my 917LX after about 10 months and got this message:
>> I did a little research and found out that this has something to do with the
>> system clock, so I rebooted and ran CLKUTIL, which showed the message:

 
> but a subsequent read shows that the clock is not set, 

Was that subsequent read after a power cycle, or during the same power-up in
which you set the clock (with clkutil)?

> How can I fix this?

The 9x7 has a Dallas Semiconductor RTC (Real Time Clock) chip (DS1287) 
with a built-in (and now-dead) battery :(

I'd love to find the HP engineer who did such a crappy design of the
backplane and his/her manager who approved the design ... there was no excuse 
for it even back then.  
(BTW, the 9x8 solves the problem by using a replaceable battery.)

The chip is on the backplane, soldered in.  (Did I remember to thank the
crappy engineer, or the manager who said "solder it, don't use a socket"?)

A simple google search for DS1287 shows that replacement chips are available,
and that some people have figured out ways to wire in a battery .... note that
those people were NOT working on a 3000, but (generally) on PCs of some kind.
I'm not sure how much clearance/room one has for adding a battery to the DS1287
inside a 9x7!

In short, I think that if you can get the system booted (by using clkutil 
first, then booting and re-setting time at the main time prompt), you'll have
to live with that.

Even shorter: buying a used 9x8 3000 is probably a cheaper, faster, and better
solution.

Stan
-- 
Stan Sieler
[log in to unmask]
www.allegro.com/sieler/wanted/index.html 

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