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  Interrupt:   21h     Function:   3Bh
 
  Title:       Set Current Directory
 
  See also:    Get Current Directory, Create Directory,
               Delete Directory, @ChDir
 
  Description:
 
     Sets the current, or default, directory using the specified drive
     and path.
 
     Input                                Output
 
     AH = 3Bh                             If function successful
     DS:DX = segment:offset of ASCIIZ       Carry flag: clear
             path name
                                          If function unsuccessful
                                            Carry flag: set
                                            AX = Error code (03h)
                                            See: ◄Error codes►
                                    -♦-