Int 21H, AH=22H

1 and higher

WRITE RANDOM RECORD TO FCB FILE

      AH = 22h
      DS:DX -> opened FCB (see #01345)
      Disk Transfer Area contains record to be written

AL = status

          00h successful
          01h disk full
          02h segment wrap in DTA

the record is written to the current file position as specified by the random record and record size fields of the FCB

the file position is not updated after writing the record

if the record is located beyond the end of the file, the file is extended but the intervening data remains uninitialized

if the record only partially fills a disk sector, it is copied to 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

AH=15h,AH=21h,AH=28h,AH=40h

Text based on Ralf Brown Interrupt List Release 61