en:docs:dos:api:int21:21

Note: This API call is for DOS personality only. Use Family API for portability.

2018/09/07 07:04 · prokushev

Int 21H, AH=21H

Version

1 and higher

Brief

READ RANDOM RECORD FROM FCB FILE

Family API

Input

      AH = 21h
      DS:DX -> opened FCB (see #01345)

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
      Disk Tranfer Area filled with 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“DOS”

Note


en/docs/dos/api/int21/21.txt · Last modified: 2020/12/09 02:36 by prokushev