INT 67H 4000H: Get EMM Status

                                                     Compatibility: EMS 3.2+ 
 Expects: AX    4000H
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 Returns: AH    EMM status
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    Info: Obtain the current status of the Expanded Memory Manager.

          Use this only after establishing the presence of EMM support (see
          Expanded Memory Specification for details).

See Also: INT 67H: EMM Services
          Extended Memory Specification (XMS)
          Interrupts and BIOS Services
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