Dave McGuire wrote:
  <snip>
   I had a PL/I compiler for CP/M years ago.  I have no idea what
 happened to those disks.  I can see writing a PL/I front-end for GCC.
   
<snip>
see
http://pl1gcc.sourceforge.net/
This package already parses multics pl1.
It does not address generating any code from the pl1 input at this time,
only the parsing problem.
As Al K already pointed out it will take more than this to get multics
running.
Jim