;**************************************************************
;***    EMS581.ASM                                          ***
;***                                                        ***
;***    function        EMS_Ems.getNumMappable40(           ***
;***                        var mappablePages: Word)        ***
;***                        : Boolean;                      ***
;***                                                        ***
;***    Returns total number of mappable pages to pointer.  ***
;***                                                        ***
;***    Returns 0 if no error or an error code.             ***
;***                                                        ***
;***    (Ems Version 4.0)                                   ***
;**************************************************************

        .model  large,pascal   

        include emsdefs.asm 

        extrn   errno:WORD  

;
;   Define entry point
;
        public  EMS_Ems@getNumMappable40

        .code

EMS_Ems@getNumMappable40 proc mappable_pages:Far Ptr Word, self:DWord

        mov     ax,GetNumMappable40     ; Make the call
        int     Ems           

        or      ah,ah                   ; Check for error
        jnz     error

        les     bx,mappable_pages       ; Return the number of...
        mov     es:[bx],cx              ; ... mappable pages

        xor     ax,ax                   ; return OK
        ret         

error:
        mov     al,ah                   ; AL gets error code
        xor     ah,ah                   ; Zero extend
        mov     errno,ax                ; Save in errno too
        ret

EMS_Ems@getNumMappable40    endp        ; End of procedure

        end                             ; End of source file