en:docs:dos:api:int21:58:03

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

2018/09/07 07:04 · prokushev

Int 21H, AH=58H, AL=03H

Version

5 and higher

Brief

SET UMB LINK STATE

Family API

Input

AH = 58h
AL = subfunction
    03h set UMB link state
	BX = new link state
	    0000h remove UMBs from DOS memory chain
	    0001h add UMBs to DOS memory chain

Return

 CF clear if successful
CF set on error
    AX = error code (01h) (see #01680)		

Notes

a program which changes the UMB link state should restore it before
  terminating
UMBs will only be available if CONFIG.SYS contains the line DOS=UMB,
  the UMBs have been linked into the memory chain with AX=5803h, and
  the allocation strategy has been set to include high memory with
  AX=5801h
 

See also

#01687,#02766 at INT 2F/AX=4310h

Note


en/docs/dos/api/int21/58/03.txt · Last modified: 2021/08/01 08:27 by prokushev