VMS Help PASCAL, Data Types, Ordinal, UNSIGNED64  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The UNSIGNED64 data type is equivalent to the following (OpenVMS
  Alpha systems only):

  Syntax:

     TYPE UNSIGNED64 = [QUAD]UINT(0)..UINT(18446744073709551615);
                                              {0..16#FFFFFFFFFFFFFFFF}