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INT 2F - DOS 5.0 - QUERY FREE HMA SPACE
        AX = 4A01h
Return: BX = number of bytes available in HMA (0000h if DOS not using HMA)
        ES:DI -> start of available HMA area (FFFFh:FFFFh if not using HMA)
Note:   called by Windows 3.1 DOSX.EXE
SeeAlso: AX=4A02h
See Also: 2F4310
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