ic-racer already got it. Understand it is a minor limitation. VERY minor.
It is a limitation, though, as I might decide spur of the moment to shoot 1600 if something starts happening in the evening and I want to take pictures, or 400 if it's daylight. Having to pre-choose the ISO that's dx encoded limits that. IF I use exposure compensation to move the meter two stops on a 400 encoded can it works, but then I lack any further compensation in case I want to fiddle a bit with to bring up shadows it on a contrasty scene, etc.
These complaints are remarkably petty, to the point where they don't matter practically at all. I've run a few rolls through an N75 since the post you responded to, in fact, just because it's a fun and capable camera that I got, effectively, for free. You can do well with either, even if the N80 is my personal preference.