VMS Help PASCAL, Standards  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The Compaq Pascal compiler accepts programs that conform to  two
  standards  and  a  subset  of programs that comply with a third.
  Also, Compaq Pascal provides features that are not part  of  any
  standard  (called extensions).  If you require portable code, do
  not use the Compaq Pascal extensions.

  The unextended Pascal standards are as follows:

   o  American National Standard ANSI/IEEE770X3.97-1989 (ANSI)

   o  International Standard ISO 7185-1989 (ISO)

  Compaq Pascal accepts programs that conform to either standard.

  The Extended Pascal standards are as follows:

   o  American National Standard ANSI/IEEE 770X3.160-1989 (ANSI)

   o  International Standard ISO 10206-1989 (ISO)

  The two Extended Pascal standards  are  identical  in  function.
  Extended   Pascal   is  a  superset  of  the  unextended  Pascal
  standards.

  Since Compaq Pascal supports many -- but  not  all  --  Extended
  Pascal  standard  features,  it cannot compile all programs that
  comply with Extended Pascal.