Hi,

> The other two pins are (probably) for backlight.  (If there is only
> one 44780 part.  If there are two, then you probably have a 4x40 and
> the extra two pins are for E2 and something else I can't remember.)
>
> HTH,
>
> Alan G. Smith
>
> P.S.  I use a truly LCD that has 16 pins, but only the first fourteen
> are used on the model without backlight.
>
Normally the baclight pins are quite seperate from the rest of the pins.
On the ones I have seen, the backlight pins are on the side of the
module while the connection pins are on the top or bottom.

Regards,
Niki