PDP 11/70, XXDP diagnostics - test-drb@ccmp.vtda.org

15 Aug 2002

John Holden wrote:
...

 Johnny Billquist wrote:

  This is typically a clock problem. You don't
have a working clock in
 your
 system.  
 I have added to my 'fixing a dead PDP-11', a simple test for line time
 clocks.

 http://www.psych.usyd.edu.au/pdp-11/hints.html 
Nice info.

The problem with RSX was as Johnny Billquist already indentified due to a missing
LTC signal. This is solved by placing a jumper on the backplane to get the signal
on the bus when generated from the DL11-W. It is described in the FSE docs, so it
is just a matter of counting the pins and make the connection.

I have also executed some diagnostics, only cache test #2 fails partly, is mentions
a possible problem with the ADM. Besides that problem, the machine works fine.

So, I have now a nice running 11/70, and the only thing left to do is to
transport the RM03 one floor up into the machine room :=(

Thanks,

Ed

...
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