On Tue, 15 Jan 2013 11:57:45 -0500 Clem Cole <clemc at ccc.com> wrote: On Tue, Jan 15, 2013 at 11:50 AM, Johnny Billquist <bqt at softjar.se> wrote: The PDP-11 C compiler is a much later product than any of the stuff you talk about here. It's something DEC did in the 90s. Fair enough - long after I was paying much attention. Do you know if it was part of GEM? The GEM suite allowed N front ends, and Y back-ends. GEM never generated code for the PDP-11. It did do IA-32, IA-64, Alpha, MIPS. I supports a range of operating systems including Windows, OpenVMS, Tru64, Linux and NonStop (although that never made it to production). To get an idea, check out my BLISS family-tree at: http://tim.sneddon.id.au/blog/Posts/A_BLISS-ful_family_tree As for PL/1 on 16 bit machines - it was done, particularly with subset compilers. Again, I lost interest in it in the early 1980s. PL/C was Cornell's version and a number of things like Intel's PL/M for the 8080 appeared, Stanfords PL/360 etc, all show it possible, PL/M was more of a language of it's own, based on PL/I. The others I can't really speak for. Regards, Tim.