Question about Texas Instruments TI-89 Calculator

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TI89 buttons not functioning

Hi, i have this problem I have not used my ti89 for a winter, winter break..u know fun times, no hw...and then when school starts again, i use my ti89 again, and all a sudden the button 5, 6 and not working. Is there anyway to fix this? the warranty is already expired =(

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  • Anonymous Nov 21, 2007

    mine is worst, the entire left side button froze! does anybody know how to fix this problem? =(

  • beint_6 Dec 12, 2007

    The top of my ti-89 is covered in blue and black lines where the top screen icons are supposed to appear you know the F 1 all the way across is covered with lines and the 7, 8, 9 and multiply x button will not work



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Posted on Nov 22, 2007


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TI89 is has locked up with error msg "undefined variable"

Without performing a hard reset, you can avoid implied multiplication and insert a multiplication sign (*) between a variable and a function. For example if you enter xsin(x) you must insert the multiplication sign (*) and write x*sin(x), otherwise the calculator will assume that xsin( is a function. It will look for it and not finding it, will send an error message. Similarly, if you want to enter x times y or some othervariable, you must insert the multiplication sign, x*y

Mar 06, 2012 | Texas Instruments TI89 Graphic Calculator

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Hi, I wonder how to use a TI89 to graph a multivariable functions's 3D picture. Thanks.


First you must configure your calculator to perform 3D graphics
Press MODE
1.The first line shown is Graph. Unfold the hidden menu list with the right arrow and choose Graph 5:3D
2. Press ENTER to validate.

Now you must define the surface you want to draw
1. Press the [diamond] key then [Y=] to get a list of function names, the first of which is z1
2. Enter the following function (or your own) z1=(x^3*y-y^3*x)/390
( x cubed times y -y cubed times x) divided by 390.
3 Press ENTER.

Graph the function
Press the [diamond] key then [GRAPH]

The graphing screen displays progress in %. When it is finished you will see a weird sombrero.

Hope it helps

Mar 21, 2011 | Texas Instruments TI-89 Calculator

1 Answer

How do you restore lost programs on TI 89

Click here to go to the Texas Instruments web site to download APPS. Stroll down to where it say's, "Technology", and left mouse click the select bar. Then stroll down to "Ti89, Ti89 titanium", and make another left mouse click. Now stroll down to "VIEW" and make another left mouse click. This will drop down a menu with all the available APPS categories. Select which category you want, and left mouse click again. Next, left mouse click, "FIND" and it will take you to all the APPS in that category. Choose the APP you want to download, and left mouse click again. This will take you to that APP's download site, and stroll down a little to "Download Item". Left mouse click the APP you want, and another screen will pop up and ask you to log in. Go ahead and click, "continue as a guest", and the APP will be downloaded to your screen. Go ahead and left mouse click "SAVE", to save it on your computer. That way you can get it later, and download it with TI connect to your calculator.
If you ever want to get to the Ti89 web site in the future just google search Ti89, and the go to one of the Ti89 education sites. All you have to do once your at the site is left mouse click, "Downloads and Activities", and the same, "Technology" bar will show up. Just repeat the process I gave you earlier, and you should have no trouble.

Dec 22, 2010 | Texas Instruments TI-89 Calculator

1 Answer

Change TI 84 OS to TI 89 OS??

And why, pray tell, would you do such a thing? You will ruin your Ti84 Plus Silver Edition and will not have a working TI89. Besides, TI connect will refuse to transfer it.
If you like the capabilities of the TI89 Titanium, buy a cheap or used one on e-bay or and spare your TI84PLus SE.

Feb 14, 2010 | Texas Instruments TI-84 Plus Silver...

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I received this solution, but at the end the calculator asked me about some invalid certificate. Now the ti 89 is stuck at the boot screen because if I retry, it goes thru the whole process again and asks...

The answer I gave you was taken verbatim from the TI FAQ and knowledge base. I copied and pasted the part relevant to you calculator.
In any case, I sent an e-mail message to, giving the link to your original question and my answer to it. I took the liberty to copy/paste your present message. I also asked about that invalid certificate.
All we can do know is wait for their reply.


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1 Answer

Using the ti89 to solve mesh equations

This book is what I used to help learn how to solve mesh circuits. A high education level helps. You just set it up as you see it in a simultaneous equation.

Electrical Engineering Applications with the TI-89
Electrical Engineering students will find the 70 topics covered in this book provide in-depth analyses of how to solve many common engineering problems using the powerful CAS system of the TI-89.
Author(s) - David R. Voltmer and Mark A. Yoder

Mar 23, 2009 | Texas Instruments TI-89 Calculator

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The TI-89 has one function to find whatever root you want of a number.

To find the cubed root of say...64, you would type:


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My ti89 titanium doesn't turn on

I had the same problem. I changed the batteries and it didn't work. I took out the batteries for about 30 minutes, and then put them back in, and it turned on.

Aug 21, 2007 | Texas Instruments TI-89 Calculator

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