> > > Date: Tue, 23 Feb 2016 19:47:37 -0500 > From: william degnan <billdeg...@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
