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INT 2F - EXTENDED MEMORY SPECIFICATION (XMS) - INSTALLATION CHECK
        AX = 4300h
Return: AL = 80h XMS driver installed
        AL <> 80h no driver
Notes:  XMS gives access to extended memory and noncontiguous/nonEMS memory
          above 640K
        this installation check DOES NOT follow the format used by other
          software

See Also: 2F4310
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