He’s running Android Donut on a TI nSpire CX graphing calculator. Unlike just about every other TI calculator, homebrew developers are locked out of the nSpire CX and CX CAS.

Texas Instruments (TI) Education Technology to bring future-ready learning to more classrooms across the country. This school ...

The TI Nspire CX model is powered by a small 150 MHz ARM-based processor, which has been just proven to be a minimum requirement for Android to barely run.