| Brand: | Texas Instruments |
| Model: | TI-89 |
| Type: | Graphical programmable scientific calculator |
| Picture: |
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| Batteries: | AAA x 4 + CR 1620 x 1 (memory backup) |
| Lifetime: |
Introduced: 1998 Terminated: 2005 |
| Notes: |
The Texas Instruments The TI-89 is basically the same as the
TI-92 Plus but housed in a more standard looking
casing and loosing the keyboard making it better suitable for exams. The
calculator’s CAS system, making it possible to perform
algebraic functions and symbolic differentiation and integration, still
excluded it from exams however.
It still has the familiar menu structure of the TI-92 series that can be summoned using the function keys and navigated using the arrow keys. 
The LCD of the specimen I was able to obtain is quite good. The LCD’s contrast can be
set using the shifted function of the up and down arrows.
Seen here is a CAS example showing the integral of the squared sine of X. A lot of useful information can be found on this Wikipedia page (link validated 2026-10-19). |
| Series: | This calculator is part of a series that started with this one, the TI-92. Here is a list of the calculators in this series, in chronological order. |
©2026 Ernst Mulder