21 Jun
2019
21 Jun
'19
4:30 p.m.
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