/sys$common/syshlp/helplib.hlb PASCAL, Predeclared Routines, Arithmetic, UNOT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  The UNOT function returns an unsigned value  that  represents  a
  binary  logical  NOT  operation  on  each  bit  of the specified
  parameter.

  Syntax:

     UNOT( u1 )

  The parameter 'u' must be unsigned.