For those who are interested: i was not able to install this from the repositories on N900 but downloading all the packages locally and using dpkg did the trick.

The voyager doesn't seem to work, even after renaming the skin.

The 92+ seems to work fine _but_ the lower line of keys goes out of screen, since fullscreen mode apparently works differently in Fremantle.

If this glitch could be fixed, we would have a virtual ti92+ running at probably the same speed of the real one, only in a much smaller space.