en:docs:dos:api:int21:28

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

2018/09/07 07:04 · prokushev

Int 21H, AH=28H

Version

1 and higher

Brief

RANDOM BLOCK WRITE TO FCB FILE

Family API

Input

      AH = 28h
      CX = number of records to write
      DS:DX -> opened FCB (see #01345)
      Disk Transfer Area contains records to be written

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/BX=0000h

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/int21/28.txt · Last modified: 2020/12/09 04:22 by prokushev