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

[Michael Thompson]

>
>
> Date: Tue, 23 Feb 2016 19:47:37 -0500
> From: william degnan <billdegnan at gmail.com>
> Subject: Re: PDP-11/20 vd one that just says pdp 11 what are the date
>         differences?? OEM?
>
> are  you sure its not H720 rather than 4720?  H720 would be the type of
> power supply from an original 11.  M11 15 would seem like the OEM 11/20
> after they abandoned the 11/10 model.  My hunch would be the date code is
> late 1970 early 1971.
> --
> @ BillDeg:
>

I looked at the picture of the metal serial number tag again. It is
definitely 4720. The white paper tag for the system configuration says that
it was configured on 3/3/73 with a KC11 processor, two DL11A serial ports,
an MM11E memory, and a H720E power supply.

-- 
Michael Thompson