Mystery 1970 core board

Bob Smith bobsmithofd at
Wed Mar 4 09:46:46 CST 2020

LEC16 was a copy of the PDP11. Lockheed sold it to BBN. BBN relabeled
it Pluribus.
I was part of the DEC engineering team looking at purchasing the LEC,
as one of the features was the ability to be an Arpanet IMP.
I was quite familiar with t the Unibus, and noticed the print set was
very similar to a negative copy of an 11/20 print set.
I raised this with the boss and legal.  The machine was then referred
to as the Lockheed SUE.

On Wed, Mar 4, 2020 at 7:44 AM Jules Richardson via cctalk
<cctalk at> wrote:
> On 3/3/20 6:18 PM, Jules Richardson via cctalk wrote:
> >
> >
> > Hopefully collective wisdom can help on this one - does anyone have a clue
> > what system this core board was from
> I think I may have figured it out. Back when I picked these up (I have
> another one, too) they were in a pile of boards from all sorts of different
> systems, as they were at a location which used to be an electronics surplus
> store - so I figured they could be anything.
> However, I picked up a couple of Lockheed MAC-16 front panels at the time,
> and I was just digging through some info on that machine and realized that
> it was also known as the LEC-16; in light of that, the little "LEC" logo on
> these boards seems telling. That was a 16 bit system (and as Brent
> mentioned, there may be another set of core hidden on the other side of the
> plane) and was around the 1969/1970 timeframe, so that fits, too.

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