High Quality Content by WIKIPEDIA articles! TI-BASIC is the unofficial name of a BASIC-like language built into Texas Instruments (TI)`s graphing calculators, including the TI-83 series, TI-84 Plus series, TI-89 series, TI-92 series (including Voyage 200), TI-73, and TI-Nspire. TI usually doesn`t refer to the language by name, but the name TI-BASIC has been used occasionally in developer documentation.