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  Description:  Sequential Write
 
  Writes the next sequential block of data into a file and then incre-
  ments the file pointer appropriately.
 
  Input                                     Output
  ══════════════════════════════            ══════════════════════════════
  AH=15H                                    AL=00H  if write successful
  DS:DX=segment:offset of prev-                01H  if disk is full
        iously opened file con-                02H  if segment wrap
        trol block
                                    -♦-