DEC MM15 core mem found

Pontus Pihlgren pontus at Update.UU.SE
Tue Dec 8 06:03:02 CST 2015

I've seen a memory assembly from a PDP-15 and it looks very much like 
this. Also, if each connector pair corresponds to one bit it adds up to 
18 which matches the word lenght of a PDP-15.

Of course, PDP-1, -4 and -7 used 18 bit word lenght, but they were not 
made with flip-chips.

PDP-9 is made with flipchips and is 18 bit. But I seeem to recall it's 
memory looks quite different.


On Tue, Dec 08, 2015 at 11:58:07AM +0100, Jörg Hoppe wrote:
> I help cleaning out a large repository of DEC parts.
> There a quantity of DEC core module assemblies appeared.
> According to PDF docs these must be PDP-15 MM15's, but no labels are on the
> boards.
> I show/offer some of them at
> ,
> under "core memory"
> Can somebody confirm they are MM15's?
> Are any PDP-15 running at all?
> Thanks,
> Joerg

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