unix developed on 11/20 with 20 on panel or machine that just said pdp/11?

[Bob Smith]

My recollection, Unix on the 11 started with the 20 but because of the
limited capabilties, it really was done on the /45.
The three rings or 3 execution levels were not supported on the
original machine.
bb

On Wed, Jun 19, 2019 at 5:20 PM ED SHARPE via cctalk
<cctalk at classiccmp.org> wrote:
>
> unix developed on 11/20 with 20 on panel or machine that just said pdp/11?
>
> Help - have a  nice  looking  11/20  plus  a  weird analog  computer and  a  Nike guidance  gyro platform  for  AJAX (  2  gyros loose  need  prints  to  rewire  correctly)      in  trade  for  and  extra  ribbon Mike  we  had.
> so anyway today's  questions
>
> -  bell labs  UNIX  machine   says  11  or  11/20
> -anyone have schematics or wiring chart  for NIKE AJAX  Gyro Plantform?
> Drop offlist  as  not  to  clutter  things
> thanks  Ed#