Thanks so much for the reply, I was thinking this was the case and I'd need to implement a table lookup. I will walk down this path as well as consider the BeagleBone as well. I REALLY like the DUE, but I am finding the choices for pinout are limiting what I'd like to do. For instance, I'd really have liked to use the SMC to control a 16-bit LCD, but, the pinout chosen will not allow me to do that, one of the pins isn't even brought out.
Yet, I have to say, it's still VERY easy to code which I think was their biggest goal and certainly exceeds the other boards I have looked at. With the BeagleBone or the ST solutions, I've pretty much have to build my complete tool chain myself mostly. And given the issues with RT Linux not being as RT enough for me, I'd be looking at using the Starterware stuff for the Cortex M8.
Given I am in the development part of my project, implementing my code on both will be more interesting nevertheless.