TI-OS for Calculator

Short for TI Operating System, used generically even though it´s distinct for each model calculator. The normal level of the calculator software, as opposed to where you go when you run assembly programs. Only the TI-OS is supported by TI. The TI-OS version can be upgraded on calculators with Flash ROM.

Operating systems provide a software platform on top of which other programs, called application programs, can run. The application programs must be written to run on top of a particular operating system.