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                                    MDU.COM                                   

             Size (recs) CRC   Version    Author/Latest Issue      Disk
MDU.COM        2k (9)    2E71  1.1        Gene Pizzetta 6/90       Z3COM7
MDU.CIM        2k (9)    A6B6  1.1        Gene Pizzetta 6/90       Z3COM7

  1- Syntax  2- Notes                                                         


   MDU is a tiny ZCPR3 utility to set or display the  maximum drive  and  user
(MAXDU) in the environment descriptor.  It was written to test software and to
allow reconfiguration of my drive system without creating a new ENV file.   It
might also be useful for RCP/M's.  Original by Gene Pizzetta (06/17/90).
:1

    Syntax   MDU {d}{u}{:}

   Sets  maximum drive and/or user in the environment descriptor to  the given
value (A-P,  0-31).   A  following colon is optional.   If no  parameters  are 
given, MDU displays current maximum drive and user.

   If the  quiet flag is  set,  the current  maximum DU is reported if  MDU is 
called with no parameters;  otherwise,  only error messages will be displayed.  
If the  wheel byte is  reset (off),  the current status is displayed,  but the 
MAXDU bytes in the environment are not changed.

   If the given drive or user is out of the permitted range, the program error 
flag will be  set  to 2 (invalid directory).   If the command line is invalid, 
the error flag  will be  set  to 4 (unknown error).   In either case the error 
handler is invoked, if one is running.
:2
 MDU Notes 

   a. Vs 1.1 updates (06/22/90, Gene Pizzetta):
      - Fixed bug that caused error handler to be invoked when quiet flag was 
        set.  
      - Added wheel byte support.  If wheel byte is reset, displays current
        maximum drive/user, but changes nothing.
        