PDP-11/20 vd one that just says pdp 11 what are the date differences?? OEM?

26 Feb 2016

...
  From: Michael Thompson 
...
  The white paper tag for the system configuration says
that it was
 configured on 3/3/73 with a KC11 processor 
That's an -11/15, then. The -11/20 has a KA11 processor. So the front panel
just says "pdp-11"?

	Noel

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PDP-11/20 vd one that just says pdp 11 what are the date differences?? OEM?