Map Memory                                  

Input

Output

AX

44h Physical (0-3) Error Code   AX

BX

 Logical Page Number     BX

CX

        CX

DX

 EMM Handle     DX
     Maps one of the logical pages of expanded memory  assigned  to  a
     handle onto one of the four physical pages within the  EMM's page
     frame.

     If the logical page number is 0FFFFh, the physical page specified
     in AL will be unmapped (made inaccessible for reading or writing)

Note:   Downward compatible with both EMS and EEMS 3.2; EMS and EEMS
        3.2 do not support unmap (logical  page  0FFFFh) capability.
        Also, EEMS 3.2 specified there were precisely  four physical
        pages;  EMS 4.0 uses the subfunctions  of  function  58h  to
        return   the  permitted  number  of  physical  pages.   This
        incorporates  the  functionality  of function 69h ("function
        42") of EEMS. 


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