The TI-89 is a popular graphing calculator made by Texas Instruments, originally released in 1998. It features powerful computer algebra system (CAS) that can solve albebraic expressions in symbolic terms; most other calculators solve in terms of number only. For example, entering (x^3-x^2-8x+12)/(x+3) returns x − 4x + 4, which is by default. The current version of the calculator that is sold in stores is the TI-89 Titanium model, released in 2004 to replace the popular original TI-89. In the United States, the TI-89 is allowed by the College Board on all calculator-permitted tests, including the SAT, however it is banned from some other tests and classrooms because of it's advanced function. The retail price of this calculator is $150.
- Motorola 68000 32-bit microprocessor running @ 10, 12, or 16 MHz (depending on hardware version)
- Algebraic factoring of expressions
- Algebraic simplification (CAS)
- Evaluation of trigonometric expressions to exact values
- Equation solving for a certain variable (CAS)
- Finding limits of functions
- Symbollic differenatiation and integration
- Directly programmable in TI-BASIC
- Can run third-party applications
The TI-89 Titanium was relased in the summer of 2004 as a replacement to the popular original TI-89 calculator. It expands the available amount of flash memory to four times of its predecessor, adds a mini-USB port for connectivity with a PC, other TI-89 calculators, or other calculator accessories including a full-size keyboard.
It very common for students, in an effort to curtail their school's calculator restrictons, is to remove the internal components of the TI-89 and put in in the TI-83+ shell. There also have been students doing the reverse (ie. putting the TI-83 components inside the TI-89 shell) and selling the subsequent calculator as a true TI-89 and profitting in the process.