





                                    SUBTASK



        1.0  VERSION 2.01

        In the spring of 1978 I published in _T_h_e _M_u_l_t_i_-_T_a_s_k_e_r a  Fortran
        interface to the subtasking and chaining facilities of IAS V2.0.
        This interface, subroutine  SUBTASK,  was  also  made  available
        through the RSX-11/IAS SIG Chicago tape.

        This interface allowed the Fortran programmer to use most of the
        facilities  available  to  Macro programmers via the TCS macros.
        Only a few changes were necessary to make SUBTASK V2  work  with
        the  TCS  provided  in  IAS  V3.0.  File SUBTASK.COR is a SLIPER
        command file to effect these  changes.   Note  that  SUBTASK.COR
        should  only  be  applied  to  the SUBTASK.MAC as printed in _T_h_e
        _M_u_l_t_i_-_T_a_s_k_e_r or as distributed on the Chicago tape.   It  should
        _N_O_T be applied to the SUBTASK.MAC supplied with this file.



        2.0  VERSION 3.0

        SUBTASK.MAC is a greatly revised version  of  the  original  TCP
        Fortran  interface.   All of the previous entry points have been
        changed to add error returns.  In  addition,  new  entry  points
        have been added to reflect the increased functionality available
        in the IAS V3.0 TCP macros.

        The *.FTN files are provided to represent a  Fortran  analog  of
        the  sample  macro  tasks  included  in  Digital  documentation.
        SUBTASK.BIS assembles the  SUBTASK  subroutine  and  provides  a
        demonstration  of the sample tasks.  The batch stream and sample
        tasks may be used with either version of SUBTASK.MAC.



        3.0  SUPPORT

        Support for SUBTASK V2.0 and V2.01  ceases  with  this  release.
        Support  for SUBTASK V3.0 will be provided on an ad hoc basis by
        the author until Digital provides a Fortran interface  of  their
        own.   To report problems, please send a complete description of
        the problem, together with a  fully  annotated  listing  of  the
        offending   program  and  a  listing  of  any  changes  made  to
        SUBTASK.MAC to:
                        Mark F. Lewis
                        AAC-118 FAA
                        Mike Monroney Aeronautical Center
                        P.O. Box 25082
                        Oklahoma City, OK 73125

