PDP-11/45 RSTS/E boot problem

Jon Elson elson at pico-systems.com
Wed Feb 6 20:25:20 CST 2019

On 02/06/2019 12:53 PM, Noel Chiappa via cctalk wrote:
> If so, i) we're down to one problem (good news), and our problem turns into
> finding out how that section of the code got trashed (bad news).
I'm thinking it is bad memory.  It seems unlikely bus 
problems could alter only ONE BIT per word, so I think it is 
just a bad memory chip, and finding multiple words where the 
010000 bit is now turned on sure looks like that kind of 
problem.  It could, of course, be a bad driver or receiver 
on the memory board.  Might also check the other voltage in 
the memory array (+12 or whatever was used internally in the 
particular memory) and also look for degraded caps on the board.


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