Warren said > According to this page that Dennis Ritchie wrote, the original PDP-11 > they used was indeed an 11/20 but it was before there were PDP-11 model > numbers: > > https://www.bell-labs.com/usr/dmr/www/picture.html > > And, of course, the PDP-7 Unix development came before the PDP-11 version :) > > Cheers, Warren
It states that their 11/20 had a KS-11 memory management unit, was that mandatory for running v1 Unix on an 11/20? The 1971 Unix Programmer's Manual mentions their 11/20 had 24 KB (surely KW?) memory rather than 28KW. https://www.bell-labs.com/usr/dmr/www/1stEdman.html Having recently acquired a 3rd-party 8KW unibus memory module (stack + drivers + control, all integrated into a DD-11-sized form) that is the same model and brand as the 16KW unit in my ex-BHP steelworks FOX 2 (11/15), perhaps there is the very, very slim hope that if the whole thing works it might be enough to run v1 someday. That day however is a long way away, but I think I now have most of the hardware needed. Steve.
