Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 21h Function 39h
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  Interrupt:   21h     Function:   39h
 
  Title:       Create Directory
 
  See also:    Delete Directory, Set Current Directory,
               Get Current Directory, @MkDir
 
  Description:
 
     Creates a directory using the specified drive and path.
 
     Input                                Output
 
     AH = 39h                             If function successful
     DS:DX = segment:offset of ASCIIZ       Carry flag: clear
             path name
                                          If function unsuccessful
                                            Carry flag: set
                                            AX = Error code (03h or 05h)
                                            See: Error codes
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