You know, the ROM thing isn't that big of a deal if you're going to use a 65816 anyways... because you can select to disable the internal ROM and/or RAM and use external (unless we're reading the datasheet wrong over here). The ROM contains some useful stuff too, and we'd like to use it, but.. it ...

this wouldn't happen to affect any of UARTs on the MCUs like the W65C256, would it?