Int 67 Fn 6A  - Eems - Page Mapping                                        [m]

   AH = 6Ah
   AL = subfunction
       00h save partial page map
       CH = first page frame
       CL = number of frames
       ES:DI -> buffer which is to be filled
       01h restore partial page map
       CH = first page frame
       CL = number of frames
       DI:SI -> previously saved page map
       02h save and restore partial page map
       CH = first page frame
       CL = number of frames
       ES:DI = buffer for current page map
       DI:SI = new page map
       03h get size of save array
       CH = first page frame
       CL = number of frames

       Return: AL = size of array in bytes
       04h switch to standard map register setting
       05h switch to alternate map register setting
       06h deallocate pages mapped to frames in conventional memory
       CH = first page frame
       CL = number of frames

Return: AH = status (see #3319)

Note:  similar to EMS function 4Eh, except that a subrange of pages can be
     specified

See Also: AH=69h