Kearney & Trecker Core memory, may be PDP8

Johnny Billquist bqt at
Tue Nov 11 21:18:03 CST 2014

On 2014-11-12 04:00, Jon Elson wrote:
> On 11/11/2014 07:33 PM, jwsmobile wrote:
>> I can't tell for sure, but this auction may be for  PDP8 core board.
> Boy, that SURE looks like PDP-11 memory, not PDP-8.
> The cast metal stiffener I think came in at least very late in the game
> for the PDP-8.  PDP-8s usually had the colored plastic pull handles.

The fact that the board have four edge connectors and not six totally 
excludes PDP-11. As for hex size with metal handles, that was used on 
the 8/A. (Which indeed is late in the PDP-8 game, but then again, it 
wasn't until the 8/A that you saw hex boards either, so if this would be 
for a PDP-8, it would have to be an 8/A, since no other model fits the 
hex boards.)

But this is not 8/A core memory either, since those actually have all 
six connectors on the board, even if only a few signals were used on 
connector 5, and no signals were used on 6.

But since this isn't even DEC stuff, it could still possibly have been 
something for a PDP-8. PDP-11 is still out of the question because of 
the four connectors.


Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol

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