TI-89

The TI-89 is an advanced graphing calculator released by Texas Instruments in 1998. A modern model of the device is the TI-89 Titanium. The series is considered superior to previous TI graphing calculators due to its advanced symbolic manipulation of equations and the ability to recognize other computer languages. Also, the calculators were the first ones to use the 68000, or more commonly called as the 68k, programming language.