TI-92
The Texas Instruments TI-92 calculator, originally released in 1995, was an unusual calculator, quite large and with a QWERTY keyboard. Since its release it was upgraded by the TI-92 Plus. A programmable calculator, it came with a computer algebra system (CAS) based on Derive, and was one of the first calculators to offer 3D graphing. The TI-92 was not allowed on most standardized tests due mostly to its QWERTY keyboard. Its larger size was also rather cumbersome compared to other graphing calculators. In response to these concerns, Texas Instruments introduced the TI-89 which is functionally similar to the original TI-92, but smaller and without the QWERTY keyboard. Later, TI also released the Voyage 200, which is a smaller, lighter version of the TI-92 with a QWERTY keyboard.
