UNIBUS FTGH: EMM / CMU MICRORAM memories &

[Guy Sotomayor Jr]

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 at 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.
>