By the way. I’d like to thank you for mentioning the brl.pdp11 distribution below. I had despaired that I was never going to find a copy of the kernel that I cut my teeth on developing. I was able to download the set from Kirk yesterday and it is destined to replace the 2.8 BSD that I’m using oin my PiDP-11/70.
Do sources exist for a MACRO-11 assembler for UNIX? The only package I have found is written in MACRO-11 and relies on a provided binary to regenerate itself; it's on the brl.pdp11 archive on the CSRG DVD.