The biggest problem with the chip from my perspective is that the program counter register is still limited to 16-bits, so requires segmentation of code into 64k chunks.<p>Likewise I believe the &#x27;direct page&#x27; (same as the 6502&#x27;s zero page, but relocatable, like in the 6809) is limited to the first page, the lowest 64k of memory.<p>Unfortunately it&#x27;s not an architecture for which a C compiler is a natural fit.