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  Description:  Create File
 
  Creates a new directory entry in the current directory or truncates any
  existing file with the same name to zero length. Opens the file for sub-
  sequent read/write operations.
 
  Input                         Output
  ═══════════════════════       ════════════════════════════════════════════
  AH=16H                        If function successful (file was created
  DS:DX=segment:offset of        or truncated)
        unopened file           AL=00H
        control block           and FCB filled in by MS-DOS as follows:
                                drive field (offset 00H)=1 for drive A,
                                                         2 for drive B, etc.
                                current block field (offset 0CH)=00H
                                record size field (offset 0EH)=0080H
                                size field (offset 10H)=file size
                                                        from directory
                                date field (offset 14H)=date stamp
                                                        from directory
                                time field (offset 16H)=time stamp
                                                        from directory
                                If function unsuccessful (directory full)
                                AL=FFH
                                    -♦-