The ROM isn't just for simple addition. It includes sophisticated subroutines for:
However, Texas Instruments has historically taken a somewhat permissive stance compared to other tech companies. They actually host the OS updates (usually .8xu files) on their own website for free, intended for users to update their physical calculators. Emulators can often convert these official OS updates into a usable ROM format.
: Displaying a live calculator screen during presentations or online classes. Technical Specifications TI-83 Plus hardware and its ROM have specific characteristics: