Thank you. Now that you mention it. I agree. I had forgotten and confused the Harris and PE Sent from my PDP-7 Running UNIX V0 expect things to be almost but not quite. > On Nov 5, 2017, at 1:08 PM, Chet Ramey wrote: > >> On 11/5/17 3:12 PM, Clem cole wrote: >> >> IIRC Leffler and Shannon had something >> for a compiler backend at Case when they started their PE port, although >> they had to do some hacking as the model they had was different from any >> previous PE (they had to deal with a number of 7 bit and 24 bit issues). I >> believe one of the attractions to the PE was they model the Research folks >> had access was 32 bits and the PDP-11 was 16. I’ll try to ask Sam with >> what they started. > > It was a Harris /6 (I don't know how much that has in common with any PE > model), Sam started with Johnson's PCC, and it was apparently a huge PITA. > I have a copy of his thesis describing the work. > > -- > ``The lyf so short, the craft so long to lerne.'' - Chaucer > ``Ars longa, vita brevis'' - Hippocrates > Chet Ramey, UTech, CWRU chet at case.edu http://cnswww.cns.cwru.edu/~chet/