INT 2F - DOS 5+ - 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) Notes: called by Windows 3.1 DOSX.EXE supported by Novell DOS 7 SeeAlso: AX=4310h,AX=4A02h