INT 62 u - FGDRIVER v3.03 - "FG_GETMAP" - STORE IMAGE AS MODE-INDEPENDNT BITMAP
        AX = 003Ch
        ES:BX -> buffer for video mode-independent bitmap
        CX = width of bitmap in bytes
        DX = height of bitmap in pixel rows
Return: each bit in bitmap is set if corresponding pixel is of the current
          color, cleared otherwise
Notes:  For FGDRIVER v1.10, this function was "FG_GETPAGE" (see AX=0040h);
          "FG_GETMAP" was AX=0046h
        This call is ignored in text modes
SeeAlso: AX=0010h,AX=001Ch,AX=0022h

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