I was waiting to see whether Steve Johnson would speak up, because I'm not much of an expert; but yes, the VAX C compiler in V8/V9/V10 is pcc2. I think there are a few Research-specific hacks to add additional stab info for pi(9.1) and on request insert basic-block profiling for lcomp(1), but nothing major. Maybe we did some hacking on c2 as well. I know I did a lot of c2 cleanup later in my personal hacking in Toronto, but I don't think I did much if any in New Jersey. But that's independent of the compiler (modulo, I think, some of my later fixes discovered by using c2 with a different compiler). Norman Wilson Toronto ON