4 Feb
2019
4 Feb
'19
11:24 a.m.
From: Jay Jaeger
This sort of situation, where DEC diagnostics run OK
but UNIX has issues
was reported to be not all that uncommon - to the point where the urban
legend was that some DEC FE's would fire up Unix V6 as a sort of system
exerciser.
Amusing! Never heard that; our -11's were never under maintenance, so DEC FE's
never worked on them.
Make a copy of ls, and see if the copy also fails
It acts just like the original; fails when run by itself, runs OK when 'sleep'
is also running (in the background).
From: Bob Smith
We finally had the cpu backplane replaced
Ow. Not an option for Fritz, I expect. (I dunno - anyone have a spare /45
backplane?)
From: Paul Koning
Is there any way to attach a logic analyzer to various
data paths on
this machine?
I had suggested to Fritz that the symptoms led me to believe that it was time
to deploy a LA, especially since the MM trap only occurs once between him
typing 'ls' and the process failing - i.e. easy to trigger on.
He offered me the options of look at the IR or at the UNIBUS - I opted for
the IR so we can see _exactly_ what the machine _thinks_ it is doing! No
report back yet, though.
Noel