[rescue] SPARCstation 1 boot woes

[Mouse]

> Now to measure the voltages on the power harness to see if they're
> sane....

They were.  I plugged in the _other_ machine I brought home from
storage and...no explosion.  I conjecture that the one machine's C10112
had failed shorted probably from age.  I may see if I can find another
of the same machine to read the markings on C10112 and see if just
replacing it helps.  (I had something slightly similar happen with a
printer; in that case, replacing the cap fixed it.)

Unfortunately, no work, either.  Port A says

PROM Checksum test
Context Reg Test
Segment Map Test
Sizing Memory
Page Map Test
Page Map Test
Memory Test

Bad memory: Data line test: 
 EXP: 00000001 ACT: 80ff8081 PADDR: 00fec000
                                            Try changing U0502

If I have a SIMM in U0502, I get the above, sometimes with a few bits
different, but always with a recommendation that I change U0502, with
the same incorrect high three bytes, consistent across at least three
SIMMs.  With nothing in U0502, it just hangs after "Memory Test".

So I guess I'm going to go bring home some _other_ SLC/ELC boards.  But
that will take at least a half-day, probably at least a day, likely
more.

/~\ The ASCII				  Mouse
\ / Ribbon Campaign
 X  Against HTML		mouse at rodents-montreal.org
/ \ Email!	     7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B