[rescue]  Re: SPARCclassic restoration

Mike Spooner mike.spooner.ux at gmail.com
Tue Mar 27 07:12:19 CDT 2018

I've seen this "mystery sudden poweroff after POST" on a couple of
SPARCclassics a few years back. A replacement PSU fixed one of them but
not the other :-(.

I suppose the obvious belt-and-braces thing to check is the RAM SIMMs -
must be installed in pairs, try with just a single pair of 16Mb SIMMs,
one each in the 1st and 4th slots counting from the SBus end of the
chassis, and swap-in any other 16Mb 72-pin parity SIMMs you have lying
around to see if that helps.

Of course, it could still be a PSU issue... If you remove the internal
HDD, does it try to boot off the net after POST?

Out of curiosity, what did you have to do to the PSU to get this far?

-- Mike Spooner

--------- Original Message ---------
From: Richard
To: rescue at sunhelp.org
Date: Tue Mar 27 12:38:38 GMT+01:00 2018
Subject: Re: [rescue] SPARCclassic restoration
Quick update

OK so on a hunch replaced the NVRAM chip.

On power on, Pressing STOP-D to start power on self test. Serial console
plugged into ttya.

The machine now gets through post past the below error and goes through
NVRAM Access Test
TOD Registers Test
Then identifies the memory in each bank

and then powers off....!? Might have more work to do on the power supply.


On Tue, 27 Mar 2018, at 9:24 PM, Richard wrote:
> Hi Folks
> Trying to bring back a SPARCclassic. Just finished rebuilding the power
> supply and it now powers up.
> However it fails to get past the following which is the first thing
> comes out on the serial console.
> ERROR: FPU Exception Did Not Block Store, addr = 00600000, exp
> obs = -f884010, xop = 0f884010
> U-NUMBER : Suspect Tsunami Module
> Any suggestions, thoughts or guidance on the above error greatly
> Regards
> Richard
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