> On Feb 11, 2016, at 12:39 PM, William Donzelli <wdonze...@gmail.com> wrote: > >> Indeed. RSTS/E did better, with less hardware -- 64 users on an 11/70 was >> no problem, and earlier on you could run 16 users on an 11/20 (though not >> all that comfortably). > > It all depends on what the users are doing, of course. When I went to > school back in the late 1980s, the main computer was (for a while) a > VAX-11/780. Things started to get dodgy with 30 engineering students > online compiling and running crap code, and almost useless when 35 > were on. > > There was also an ancient PDP-11/70 that ran some variant of Unix, and > that general became useless after about 10 students were online. >
In the mid-to-late 70’s, I was an undergrad at CMU. I had accounts on the CS department’s systems. When I started, it was 2 KA10s. Eventually a KL10 was added (all running a *heavily* patched version of TOPS10). During the day it was nearly impossible to get stuff done with ~200 faculty and grad students on-line (on each system). I also spent a fair amount of time on C.MMP but I only wrote code for it and never actually did any “production” work on it (but it was *cool* to see…cross point switch was the ultimate in blinking lights!). TTFN - Guy
