INT 67,56 - Alter Page Map and Call (LIM EMS 4.0+)

AH = 56h

AL = 00 physical page numbers provided by caller

DX = EMM handle

DS:SI = pointer to structure with page map and call address

01 segment addresses provided by caller

DX = EMM handle

DS:SI = pointer to structure with page map and call address

02 get page map stack space required

on return:

BX = stack space required (AL = 02)

AH = status (see ~EMS STATUS~)

- if successful, the target address is called

- use a RETF to return and restore mapping context