2 Mar
2008
2 Mar
'08
7:27 a.m.
Subject: Re: VAXstation/MicroVAX 2000 CPU/FPU overheating?
From: Patrick Finnegan <pat at computer-refuge.org>
Date: Sat, 01 Mar 2008 22:02:35 -0500
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
On Saturday 01 March 2008 21:11, Dave Dunfield wrote:
It's soldered down and not removeable with out the right tools for
handling high lead count surface mount.
Me I'd pull a old MVII cpu card and do the remove and replace of the FPU
and CPU. MicroVAXIIs with good cpus and FPU and bad Qbus interfaces are
not uncommon.
Allison
The extended system tests 101, 102 and 80000106
will not test the FPU
- this may be normal, I don't know. The docs say they will test all
hardware which is installed - this may mean that the FPU is not being
full detected... I don't know.
Is the FPU socketed? If so, can you remove it, and what the boot and
test output looks like? I've not had my uV2000 opened up (or even turned on
yet...), but that'd
be my next step.
If you can't remove the FPU (likely), the diagnostics would probably be
complaining about it not working...
Maybe if I have some time, I'll dig mine out and try playing with it.
Pat
--
Purdue University ITAP/RCAC --- http://www.rcac.purdue.edu/
The Computer Refuge --- http://computer-refuge.org
3 Mar
3 Mar
3:24 a.m.
> Is the [uV2k] FPU socketed?
It's soldered down and not removeable with out the
right tools for
handling high lead count surface mount.
Me I'd pull a old MVII cpu card and do the remove
and replace of the
FPU and CPU. MicroVAXIIs with good cpus and FPU and bad Qbus
interfaces are not uncommon.
The uVII and the uV2k use identical FPU and CPU chips, even down to the
packaging? That's definitely a tidbit worth remembering.
I don't think I have a suitable uV2 donor card just now, though. :(
/~\ The ASCII der Mouse
\ / Ribbon Campaign
X Against HTML mouse at rodents.montreal.qc.ca
/ \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B
9:51 a.m.
Maybe a stupid solution, but couldn't the over heating be solved by
lowering the clock... if possible?
My theory after following this thread is that the overheating was caused
by a once borderline processor running too hot for too long causing
migration of dopants in the transistors and increasing the static power
drain.
I once had a x86 server that I overclocked for a year (calculating prime
numbers) running at full load until it started to become erratic. It was
rock solid for a year and then I lowered the frequency to the marked
frequency and five years later it was still running rock solid.
I finally had to upgrade when I was /. by Ericsson after my web address
was publicised on the intranet of Ericsson on a friday afternoon. Load
was at 35 and rising fast. :-D
Good luck!
/G?ran
der Mouse wrote:
> Is the
[uV2k] FPU socketed?
>
It's soldered down and not removeable with
out the right tools for
handling high lead count surface mount.
Me I'd pull a old MVII cpu card and do the
remove and replace of the
FPU and CPU. MicroVAXIIs with good cpus and FPU and bad Qbus
interfaces are not uncommon.
The uVII and the uV2k use identical FPU and CPU chips, even down to the
packaging? That's definitely a tidbit worth remembering.
I don't think I have a suitable uV2 donor card just now, though. :(
/~\ The ASCII der Mouse
\ / Ribbon Campaign
X Against HTML mouse at rodents.montreal.qc.ca
/ \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B
5966
days inactive
5967
days old
2 comments
3 participants
participants (3)
-
ajp166＠bellatlantic.net -
axelsson＠acc.umu.se -
mouse＠Rodents.Montreal.QC.CA