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  Description:  Random Block Read
 
  Reads one or more sequential records from a file into memory, starting
  at a designated file location.
 
  Input                                    Output
  ═════════════════════════════            ═══════════════════════════════
  AH=27H                                   AL=00H  if all requested re-
  CX=number of records to read                      cords read
  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 read
                                                    at end of file
                                           CX=actual number of records read
                                    -♦-