{{page>en:templates:dosint}}

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 ^
| [[en:docs:xms:api:00|00h]] | Get XMS Version Number | | 2 |
| [[en:docs:xms:api:01|01h]] | Request High Memory Area | | 2 |
| [[en:docs:xms:api:02|02h]] | Release High Memory Area | | 2 |
| [[en:docs:xms:api:03|03h]] | Global Enable A20 | | 2 |
| [[en:docs:xms:api:04|04h]] | Global Disable A20 | | 2 |
| [[en:docs:xms:api:05|05h]] | Local Enable A20 | | 2 |
| [[en:docs:xms:api:06|06h]] | Local Disable A20 | | 2 |
| [[en:docs:xms:api:07|07h]] | Query A20 | | 2 |
| [[en:docs:xms:api:08|08h]] | Query Free Extended Memory | | 2 |
| [[en:docs:xms:api:09|09h]] | Allocate Extended Memory Block | | 2 |
| [[en:docs:xms:api:0a|0Ah]] | Free Extended Memory Block | | 2 |
| [[en:docs:xms:api:0b|0Bh]] | Move Extended Memory Block | | 2 |
| [[en:docs:xms:api:0c|0Ch]] | Lock Extended Memory Block | | 2 |
| [[en:docs:xms:api:0d|0Dh]] | Unlock Extended Memory Block | | 2 |
| [[en:docs:xms:api:0e|0Eh]] | Get Handle Information | | 2 |
| [[en:docs:xms:api:0f|0Fh]] | Reallocate Extended Memory Block | | 2 |
| [[en:docs:xms:api:10|10h]] | Request Upper Memory Block | | 2 |
| [[en:docs:xms:api:11|11h]] | Release Upper Memory Block | | 2 |
| [[en:docs:xms:api:12|12h]] | Realloc Upper Memory Block | | 2 |
| [[en:docs:xms:api:88|88h]] | Query any Free Extended Memory | | 3 |
| [[en:docs:xms:api:89|89h]] | Allocate any Extended Memory Block | | 3 |
| [[en:docs:xms:api:8e|8Eh]] | Get Extended EMB Handle | | 3 |
| [[en:docs:xms:api:8f|8Fh]] | Realloc any Extended Memory | | 3 |