Compatibility: XMS 2.0+
Expects: AH    00H
Returns: AX    status: 0000H = successful
0001H = error and BL=XMS error code (if BL >= 80H)
else  = XMS version number in BCD; e.g., 0234H=2.34
BX    driver internal version number
DX    HMA flag: 0001H = HMA  exists; 0000H=HMA does not exist
Info: This fn obtains the version number of the Extended Memory
Specification that is supported by the installed driver.

The return value in DX indicates the existence of the HMA (use
XMS 01H to test its availability).

See Also: XMS Functions
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XMS 00H: Get XMS Version Number