en:docs:xms:api
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Note: This API call is for DOS and Win16 personality only. Use Family API for portability.

2018/09/07 05:04 · prokushev · 0 Comments

XMS API implemented via VXMS.DLL VDD 

          ; Is an XMS driver installed?
          mov     ax,4300h
          int     2Fh
          cmp     al,80h
          jne     NoXMSDriver
          
          
mov     ax,4310h
int     2Fh
mov     word ptr [XMSCALL],bx
mov     word ptr [XMSCALL+2],es

mov     ah,00h
call    [XMSCALL]
Function Description Status Version
00h Get XMS Version Number 2
01h Request High Memory Area 2
02h Release High Memory Area 2
03h Global Enable A20 2
04h Global Disable A20 2
05h Local Enable A20 2
06h Local Disable A20 2
07h Query A20 2
08h Query Free Extended Memory 2
09h Allocate Extended Memory Block 2
0Ah Free Extended Memory Block 2
0Bh Move Extended Memory Block 2
0Ch Lock Extended Memory Block 2
0Dh Unlock Extended Memory Block 2
0Eh Get Handle Information 2
0Fh Reallocate Extended Memory Block 2
10h Request Upper Memory Block 2
11h Release Upper Memory Block 2
12h Realloc Upper Memory Block 2
88h Query any Free Extended Memory 3
89h Allocate any Extended Memory Block 3
8Eh Get Extended EMB Handle 3
8Fh Realloc any Extended Memory 3