VMS Help PASCAL, /FLOAT=floattype D=platform-specific  *Conan The Librarian (sorry for the slow response - running on an old VAX)

                                   D=/FLOAT=D_FLOAT(OpenVMS VAX)
                                   D=/FLOAT=G_FLOAT(OpenVMS Alpha)

 Selects the default format for REAL and DOUBLE data  types.   You
 must  specify  'floattype'  if you use the /FLOAT qualifier.  You
 can specify the following float types on OpenVMS VAX and  OpenVMS
 Alpha systems:

       o  D_FLOAT with corresponding [FLOAT(D_FLOAT)] attribute

       o  G_FLOAT with corresponding [FLOAT(G_FLOAT)] attribute

       o  IEEE_FLOAT   with   corresponding    [FLOAT(IEEE_FLOAT)]
          attribute