11/40’s were pretty ubiquitous at CMU when I was there and at least as far as I could tell, were all configured pretty much the same (in that they all had custom writable control store). I personally dealt with 3 different sets of 11/40s: A single 11/40 with WCS that I used for doing some image processing work 2 11/40’s tied together with a prototype of C.MMP’s cross point switch C.MMP (16-way PDP11…I saw it running with 4 11/20s and 12 11/40s). At the end the 11/20s were removed and just the 11/40s remained.
There were only 2 11/45s that I knew of. The first was the “front end” that sat in front of all of the terminals and allowed connection to the various 10s (at the time there were 3: 2 KA10s and a KL10), C.MMP and CM*. The other 11/45 ran the XGP (Xerox Graphics Printer)…granddaddy of laser printers so that we could get “high quality” output (versus line printer). TTFN - Guy > On Sep 16, 2019, at 2:27 PM, Fritz Mueller via cctalk <cctalk@classiccmp.org> > wrote: > > First off, I've had a couple of follow-ups on these units, so they are spoken > for at this point. > > The member with first dibs has also offered to scan the docs and see that > they make their way to Al. > > I was wondering if these were c.mmp cast-offs? Guy: I encountered these in > the CMU computer club hardware room (Doherty Hall basement, I think?) circa > 1986. There were a couple of '11/40s adjacent, and those did have some sort > of custom writable control store cards. > > The computer club was cleaning house, so I hauled off an '11/45 with CPU > spares that looked pretty stock, the aforementioned memory units, and a rack > mount Tek 'scope (about all I could convince my friends to help me haul off > campus at the time :-) > > Not sure what ever happened to the rest of the equipment that was down there. > I know they had a couple of working Altos, on a thick net segment with the > old vampire transceivers that had the little round glass windows in an > aluminum box. And what must have been parts of an earlier PDP (I remember a > smallish teletype bolted on to a piece of white Formica desktop.) > > --FritzM. >
