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  Interrupt:   21h     Function:   27h
 
  Title:       Random Block Read
 
  See also:    Read File or Device
 
  Description:
 
     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
     CX = Number of records to read               records read)
     DS:DX = segment:offset of             = 01h (if end-of-file)
             previously opened file        = 02h (if segment wrap)
             control block                 = 03h (if partial record
                                                  read at end-of-file)
                                        CX = Actual number of records
                                             read
                                    -♦-