...and much cheaper on maintenance.
I have to disagree, it's not part of the Enhanced option. I know enhanced A320s with conventional screens. If you mean Enhanced with variable prop RAT, new bus logic aso. It's simply from newer MSN numbers, around 2004 or so?
btw it's not only the screen that is different but also a different layout. Some synoptic pages look slightly different, some writings are also different and some messages. All in all very nice to look at.
I heard from an Airbus guy that you can retrofit older busses, it's even for free, belongs to the care package, so you get the whole fleet on the same standard. Still most operators don't do it, for reason which were not really clear to my source.
Dani