In article <20101201052344.B4CD3A580D3 at yagi.h-net.msu.edu>,
    Dennis Boone <drb at msu.edu> writes:
  PRIMOS was written primarily in FORTRAN, [...] 
Didn't know about that one.
  Multics was primarily in PL/1. 
Nor this one.
  IIRC there was something earlier written in BCPL.
I'd forgotten that AmigaOS was written in BCPL.
  For current systems, z/VM has substantial amounts of
PL/S or its
 descendants, [...] 
Didn't know about this one either, mostly because I blissfully remain
ignorant of IBM equipment :-)
  Depending on your definitions, things like the Forth
in Sun ROMs might
 be counted. 
I did mention FORTH.
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