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  Description:  Sequential Read
 
  Reads the next sequential block of data from a file and then increments
  the file pointer appropriately.
 
  Input                                     Output
  ══════════════════════════════            ══════════════════════════════
  AH=14H                                    AL=00H  if read successful
  DS:DX=segment:offset of prev-                01H  if end of file
        iously opened file con-                02H  if segment wrap
        trol block                             03H  if partial record at
                                                     end of file
                                    -♦-