Int 21/AH=22h

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DOS 1+ - WRITE RANDOM RECORD TO FCB FILE

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

Return:
AL = status 00h successful 01h disk full 02h segment wrap in DTA

Notes: 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

See Also: AH=15h - AH=21h - AH=28h - AH=40h

Category: DOS Kernel - Int 21h - D

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