INT 62 u - FGDRIVER v3.03 - "FG_GETMAXY" - GET MAXIMUM ROW IN SCREEN SPACE
        AX = 003Eh
Return: AX = maximum Y coordinate in screen space
                (or character space if in text mode)
Note:   For FGDRIVER v1.10, this function was "FG_GETVPAGE" (see AX=0043h);
           "FG_GETMAXY" was AX=000Bh
SeeAlso: AX=003Dh,AX=00A1h

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