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

  Boolean values are the result of testing relationships for truth
  or  validity.   The  Boolean  data  type  consists  of  the  two
  predeclared identifiers FALSE and TRUE.  The expression
  ORD(FALSE) results in the value 0; ORD(TRUE) returns the integer
  1.