en:docs:dos:api:int21:44:04

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

2018/09/07 07:04 · prokushev

Int 21H, AH=44H, AL=04H

Version

2 and higher

Brief

READ FROM BLOCK DEVICE CONTROL CHANNEL

Family API

Input

AX = 4404h
BL = drive number (00h = default, 01h = A:, etc.)
CX = number of bytes to read
DS:DX -> buffer

Return

CF clear if successful

    AX = number of bytes actually read
CF set on error
    AX = error code (01h,05h,06h,0Dh) (see #01680 at AH=59h/BX=0000h)

Macro

Notes

format of data is driver-specific
this function was not supported by Digital Research's DOS Plus

See also

AX=4402h“DOS 2+”,AX=4405h“DOS”,INT 2F/AX=122Bh

Note


en/docs/dos/api/int21/44/04.txt · Last modified: 2021/05/01 13:11 by prokushev