I do have significant experience in this area. I am looking to see if there are any in current use, ones that I haven't heard of. I have worked directly with

I do have significant experience in this area. I am looking to see if there are any in current use, ones that I haven't heard of. I have worked directly with two of these. Three of us wrote a compiler for a PL/M derivative in Bliss 36 running on the DEC PDP-10. And we tinkered briefly with PL32 on the vax. The team that brought XPL to the Sigma 5/7/9 series also wrote a low-level PL/S style language. I'm trying to locate the paper for that, so far with no luck. I'm familiar with the Burroughs low-level algol efforts, and am fascinated by the B 1700, which had an machine word size that was set on a per-program basis. Fundamental to this is that they are machine specific, and I am seeing that there are some possible advantages to that. Thanks for the references. As a result, I ran across http://143.95.72.211/ebooks/history_of_programming_languages.pdf http://143.95.72.211/ebooks/history_of_programming_languages... which connects with many of my memories. And the Belt architecture is quite fascinating, but it doesn't seem to be moving very fast. I now add to the list one called PL-11 for the PDP-11. I was first exposed to the chicken and egg problem in A Compiler Generator which launched my career in another direction. Thanks much for the rich references which are directly useful to my search. (montana expat here)