Int 21 Fn 21  - DOS 1+ - Read Random Record From Fcb File                  [D]

   AH = 21h
   DS:DX -> opened FCB (see AH=0Fh)

Return: AL = status
       00h successful
       01h end of file, no data read
       02h segment wrap in DTA, no data read
       03h end of file, partial record read
   [DTA] = record read from file

Notes: the record is read from the current file position as specified by the
     random record and record size fields of the FCB
   the file position is not updated after reading the record
   if a partial record is read, it is zero-padded to the full size
   not supported by MS Windows 3.0 DOSX.EXE DOS extender

See Also: AH=14h,AH=22h,AH=27h,AH=3Fh