I didn't say that they said "there was never a single KA11 11/10 sold, not one installed". So I just spent an hour looking through all the standard DEC histories (e.g. Bell, Mudge, McNamara, "Computer Engineering: A DEC View of Hardware Systems Design", etc, etc, etc, etc, etc) and I was unable to find _anything_ about either the 'first' -11/10; or even the -11/15, for that matter! So I don't know where I saw the mention of the 'first' -11/10 being what later became the 11/15. I _did_ find a mention of the 'first' -11/10 in the 1970 "PDP-11 Handbook" (pg. 1), with the specs as in the 1969 price list. Unlike the -11/15, which did have differences in the CPU itself, it seems that the 'first' -11/10 differed from the -11/20 only in the memory that came with it - i.e. the CPU was the identical KA11 as in the -11/20. So, do you know of any engineering document or photograph of one of those 'first' -11/10's? My bet is that there probably are none - because the machine likely never existed. (Although DEC may have sold a few, what was shipped was probably an -11/20 - with a front panel reading 'PDP-11', which may be why the earliest -11/20's said that - with the configuration listed for the 'first' -11/10.) To repeat: To the extent that one allocates the name "-11/10" to anything, it should, by virtue of the existence of _many actual physical instances_, _marked as such_, be to the KD11-B machine. Noel PS: Amusing factoid: I have a PDP-11/20 price list from April 1, 1972 which lists a "PDP-11/21"! (Versions are -CA, -CB, -CE, -CF.) It's repeated multiple places throughout the list, which leads me to believe it's not a typo.) No idea what that was all about.