Plessy core memory

Jon Elson elson at
Sun Jan 9 20:47:10 CST 2022

On 1/9/22 4:04 PM, Chris Zach via cctalk wrote:
> I'm working on my pdp11/10 getting it back together. One 
> problem I think I have is that the secondary memory (a 
> Plessy 700101-100) may be shorting the -15 line for some 
> reason. Working on it, but does anyone have a manual or 
> anything like that for this kind of memory board?

Check for Tantalum capacitors on the -15V.  These often fail 
after a period of not being powered and then having power 
applied suddenly.


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