INT 62 u - FGDRIVER v3.03 - "FG_MEMAVAIL" - QUERY AMOUNT OF FREE MEMORY
        AX = 005Ch
Return: DX:AX = number of bytes of conventional memory available
Note:   For FGDRIVER v1.10, this function was "FG_TRANSFER" (see AX=00A9h);
          "FG_MEMAVAIL" was AX=009Bh
SeeAlso: AX=004Ch,AX=005Dh

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