INT 2F - EXTENDED MEMORY SPECIFICATION (XMS) v2+ - INSTALLATION CHECK

Classification: memory management
	AX = 4300h
Returns:
AL = 80h XMS driver installed
	AL <> 80h no driver

Note:
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: AX=4310h