PDP-11/45 RSTS/E boot problem

Fritz Mueller fritzm at fritzm.org
Mon Feb 4 17:27:48 CST 2019

>>> The obvious answer is bad memory.
>> At the board level, yes.  Deeper, it could be bad memory bits or bad
>> memory decode.
> Yes, one of the standard early PDP-11 memory tests is the "no duplicate address test".

I should say that the memory board is not _completely_ whack -- it is passing the rather thorough MAINDEC ZQMC, a 0-124k exerciser with multiple pattern/sequence tests which also kicks around the KT11.

That doesn't rule out the possibility that there is a lurker in there not covered by the DEC diags.  But if there is, its something subtle...

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