The complete guide to the TI-89 Titanium — its CAS, key features, comparisons, and FAQs.
The TI-89 is Texas Instruments' most powerful handheld graphing calculator. What makes it special is its built-in CAS (Computer Algebra System): instead of only giving decimal answers, it works with symbols. It can simplify algebraic expressions, factor polynomials, solve equations exactly, and compute derivatives and integrals step by step.
Our online TI-89 emulator runs right in your browser using the open-source PedroM system software, so you get the authentic TI-89 experience without downloading anything or owning the physical calculator.
1. Click the ON key at the bottom-left of the keypad to power it on.
2. Type calculations directly on the HOME screen — for example, 2+2 then ENTER.
3. Press 2ND (top-left) to access the blue secondary functions printed above each key.
4. Press Y= to enter functions, then GRAPH to plot them.
5. Try the CAS: type solve(x^2-4=0,x) and press ENTER — it returns x=2 or x=-2.
6. For derivatives, type d(x^3,x) to get 3x^2. For integrals, use the calculus menu.
| Feature | TI-89 | TI-84 Plus |
|---|---|---|
| Computer Algebra System (CAS) | Yes | No |
| Symbolic differentiation & integration | Yes | No |
| 3D graphing | Yes | No |
| Screen resolution | 160 × 100 | 320 × 240 (CE) |
| Best for | College calculus, engineering | High school, standardized tests |
| Allowed on the ACT | No | Yes |
| Allowed on the SAT / AP | Yes | Yes |
Yes. Our TI-89 online emulator is completely free in your browser. No download, installation, or signup is needed.
CAS stands for Computer Algebra System. Unlike a regular graphing calculator, a CAS calculator like the TI-89 can manipulate symbols: it simplifies expressions, factors polynomials, solves equations exactly, and computes derivatives and integrals symbolically.
Choose the TI-89 for college calculus, linear algebra, and engineering where symbolic math helps. Choose the TI-84 Plus for high school math and standardized tests, since the TI-89 is banned on the ACT.
Yes. The TI-89 supports 3D graphing. Press MODE, set Graph to 3D, then enter your function in Y= and press GRAPH.
The TI-89 is allowed on the SAT and on AP exams, but it is NOT allowed on the ACT because of its CAS capabilities. Online emulators are for practice only and cannot be used in any exam.
Yes. The emulator runs in any modern mobile browser. Tap the calculator keys on the keypad image to enter calculations.
This is an independent educational website and is not affiliated with or endorsed by Texas Instruments. TI-89 is a trademark of Texas Instruments. The emulator runs the open-source PedroM operating system, not TI's proprietary software.
The classroom-standard color graphing calculator.
The classic graphing calculator for high-school math.
Fast function plotter for quick graphs.
Scientific calculator for everyday math and science.
TI-84 Calculator Online, along with the TI-83 Plus, TI-89 CAS graphing calculator, online graphing calculator and TI-30XS scientific calculator, provides students with versatile digital tools for solving equations, plotting graphs, and handling complex math problems. These calculators can be used directly in any browser without installation, making them perfect for math and science students looking for quick and easy solutions.
© 2026 — Revision. All Rights Reserved.