I had to fix a few screen alignment issues, but there wasn't too much work to make it look ok. The key scanning needs some work to work with the 89's different layout, though.
I plan to work almost exclusively with the TI-92+ since it has a larger screen. Most of the pieces I need to write from now on will work the same on both calculators. Once I have a more complete system I can work on the 89 keyboard layout issues.