I finished up the mode changing by listing out all of the mode transitions and the conditions for switching to modes. With that clearly defined, making all of the changes in the code was easy. I also added the ability to power down by going to 2nd->Off which sends the shutdown command to the system.  If you're in TI-83 mode, then it will avoid powering off the system. Icons are loaded relative to the current directory rather than having the path hardcoded, which helps with flexibility. Earlier tonight, I was on Adafruit's Show and Tell and you can watch me give a brief overview of the calculator. In case it doesn't jump to the correct time from my link, my presentation starts about 11:37.