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  Description:  Get Current Directory
 
  Obtains an ASCIIZ string that describes the path from the root to the
  current directory, and the name of that directory.
 
  Input                                    Output
  ═════════════════════════════            ══════════════════════════════
  AH=47H                                   If function successful
  DL=drive code (0=default,1=A,            Carry flag=clear
      etc.)                                and buffer is filled in with
  DS:SI=segment:offset of 64-               full pathname from root of
         byte buffer                        current directory
                                           If function unsuccessful
                                           Carry flag=set
                                           AX=error code
                                    -♦-