en:docs:dos:api:int21:22

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

2018/09/07 07:04 · prokushev

Int 21H, AH=22H

Version

1 and higher

Brief

WRITE RANDOM RECORD TO FCB FILE

Family API

Input

      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

Note

DOS API
Process manager INT 20H, INT 21H: 00H, 25H, 26H, 31H, 34H, 35H, 4CH, INT 22H, INT 27H, INT 28H
File manager INT 25H, INT 26H, INT 21H: 0DH, 0EH, 0FH, 10H, 11H, 12H, 13H, 14H, 15H, 16H, 17H, 19H, 1AH, 1BH, 1CH, 21H, 22H, 23H, 24H, 27H, 28H, 29H, 2EH, 2FH, 32H, 3305H, 36H, 39H, 3AH, 3BH
Character Device I/O INT 29H, INT 21H: 01H, 02H, 03H, 04H, 05H, 06H, 07H, 08H, 09H, 0AH, 0BH, 0AH, 0CH
Signals INT 23H, INT 24H, INT 21H: 3300H, 3301H, 3302H
Memory manager
Date and Time INT 21H: 2AH, 2BH, 2CH, 2DH
Misc INT 21H: 30H, 3306H, 3700H, 3701H, 3702H, 3703H
NLS INT 21H: 3303H, 3304H, 3800H, 3801H
2018/09/04 19:23 · prokushev

en/docs/dos/api/int21/22.txt · Last modified: 2020/12/09 02:41 by prokushev