osFree wiki - en:docs:dos:api:int21:58 http://osfree.org/doku/ 2026-04-09T22:50:26+00:00 osFree wiki http://osfree.org/doku/ http://osfree.org/doku/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2024-05-03T05:48:58+00:00 Anonymous (anonymous@undisclosed.example.com) 00 http://osfree.org/doku/doku.php?id=en:docs:dos:api:int21:58:00&rev=1714715338&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=58H, AL=00H Version 2.11 and higher Brief GET MEMORY ALLOCATION STRATEGY Family API Input AH = 58h AL = 00h Return CF clear if successful AX = current strategy (see #01679) text/html 2024-05-03T05:50:50+00:00 Anonymous (anonymous@undisclosed.example.com) 01 http://osfree.org/doku/doku.php?id=en:docs:dos:api:int21:58:01&rev=1714715450&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=58H, AL=01H Version 2.11 and higher Brief SET MEMORY ALLOCATION STRATEGY Family API Input AH = 58h AL = 01h BL = new allocation strategy (see #01679) BH = 00h (DOS 5+) text/html 2024-05-03T05:51:27+00:00 Anonymous (anonymous@undisclosed.example.com) 02 http://osfree.org/doku/doku.php?id=en:docs:dos:api:int21:58:02&rev=1714715487&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. Int 21H, AH=58H, AL=02H Version 5 and higher Brief GET UMB LINK STATE Family API Input AH = 58h AL = subfunction 02h get UMB link state Return CF clear if successful AL = current link state 00h UMBs not part of DOS memory chain 01h UMBs in DOS memory chain CF set on error AX = error code (01h) (see #01680) text/html 2024-05-03T05:52:03+00:00 Anonymous (anonymous@undisclosed.example.com) 03 http://osfree.org/doku/doku.php?id=en:docs:dos:api:int21:58:03&rev=1714715523&do=diff Note: This API call is for DOS and Win16 personality only. Use Family API for portability. 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