John Heffernan

          RCA/AS

          BOX 588

          Burlington, MA 01803

          (617)229-3887



          This directory contains a copy of a paper called "Using  DEC  VAX
     Software  From  Pascal"  given  at  the  spring  1984 DECUS symposium.
     Included are  examples  of  using  the  librarian,  tparse,  RMS,  set
     message, and set command.  Also, the librarian status codes are given.
     These examples can be reused for  your  applications.   A  program  to
     generate  set  message  error  constants  for a PASCAL include file is
     given.  Another example of using lib$tparse is  given.   This  program
     finds all valid binary coded Turing machine programs.
        The files in this directory are as follows.

        These file make up the paper source :
        ABSTRACT.RNO
        PAPER.RNO
        LBRFUN.REQ
        TBLOCK.REQ
      
        A copy of the paper is in:
        PAPER.MEM

        A program to generate an PASCAL include file for set message constants
        is in the two modules:
        GENERRMSG.PAS which is the main module
        RMSERROR.PAS  which is a giant case statement which spits out 
                      the pascal I/O errors message.  Note that these 
                      constants are NOT compatable with the set message
                      utility and can not be lib$signalled. 
                      These two files are should be linked.

        GEN.COM invokes set message and generrmsg.  The input is a sample set 
                message source in file ERRORS.MSG.  Set message creates 
                the file ERRORS.LIS whcih is the input to generrmsg. 
                Generrmsg outputs the include file errors.pas.
                Note that the errors.obj created by set message must be 
                linked in with your program so that the text messages can
                be found by lib$signal.
        

        ENUMTM.PAS is another example of using lib$tparse.  This program 
                   finds and lists all valid Turing machine programs.

        PARSETAB.MAR is the state table for the above.  It must be linked 
                     with ENUMTM to produce the image.  (This table 
                     actually those programs with up to two instructions;   
                     there are many such programs!).