TI Education has announced that the newest OS for the TI-83 Premium CE, the French version of the TI-84 Plus CE, removes the ability to run native programs - assembly, or ASM, and by extension C programs, which compile into assembly. This new version, OS 5.5.1, both disables assembly support and prevents the OS from being downgraded. BASIC, and where supported, Python, will continue to work as-is. Although no such software update has been announced for the TI-84 Plus CE yet, our observations of the broadly shared featureset between the TI-84 Plus CE and the TI-83 Premium CE makes us strongly suspect that ASM/C support will be removed from the TI-84 Plus CE in a similar OS update in the near future.
The end of an era. One of my forest forays into programming was fiddling with a friends TI calculator.