Int 21 Fn 28  - DOS 1+ - Random Block Write To Fcb File                    [D]

   AH = 28h
   CX = number of records to write
   DS:DX -> opened FCB (see AH=0Fh)
   [DTA] = records to write

Return: AL = status
       00h successful
       01h disk full or file read-only
       02h segment wrap in DTA
   CX = number of records written

Notes: write begins at current file position as specified in FCB; the file
     position is updated after writing
   if CX = 0000h on entry, no data is written; instead the file size is
     adjusted to be the same as the file position specified by the random
     record and record size fields of the FCB
   if the data to be written is less than a disk sector, it is copied into
     a DOS disk buffer, to be written out to disk at a later time
   not supported by MS Windows 3.0 DOSX.EXE DOS extender

See Also: AH=22h,AH=27h,AH=40h,AH=59h