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