Question about Texas Instruments TI-89 Calculator

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TI 89: unnecessary Overflow

I am a mathematics instructor helping a student with a calculator problem. The calculator reports an overflow message for values it should be able to calculate. I know the calculator reports this message when the value of the number has more digits than is allowed for the given mode.

I am calculating an easy compound interest problem in one-step:


I use my older TI-83 and get the approximate answer 1271.21. I know this calculator should be able to evaluate this expression. Is this a fixable hardware problem or has TI announced anything lately about a repair? This is a brand new calculator and I have reset all of the original settings.

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Mine said 1271.216 What hardware you have?

Posted on Aug 26, 2009

  • Richard Klein
    Richard Klein Aug 27, 2009

    Trying to assimulate your problem, I did find the overflow but only in the exact mode. This is very correct! Auto mode gives 1271.22 because of the turnicate.


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Error memory when loading calculus made easy on ti-89 titanium

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I am aware that this does not fully answer your WHY question but it may help you decide what to do.
On the TI92 Plus, which has the latest OS for that machine 2.09 Advanced mathematics Software one gets the result Pi in EXACT or AUTO modes and 3.1415926536 in APPROXIMATE mode.
However when in EXACT/AUTO mode the calculator displays a warning message Memory Full, Simplification may Not Be Complete. (see screen capture.)

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Apr 30, 2011 | Texas Instruments TI-89 Calculator

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Can I use on the ACT exam

your model isn't listed, but read rules Calculators are only allowed to be used on the mathematics test; however, a calculator is not necessary to take the exam. Any student who attempts to use a calculator on the science exam will be dismissed and the worksheet will not be scored. It is the student's responsibility to make sure they bring sufficient batteries and that the calculator works properly. Test center personnel do not have backup calculators or batteries. 1.jpg Only certain types of calculators may be used during the test. Most four-function, scientific or graphing calculators are permitted, but some features may have to be disabled before the calculator can be used. Devices that include calculators among their functions-cell phones, laptops, PDAs-are forbidden, as are calculators with built-in algebra capabilities or QWERTY keyboard buttons. Also, certain specific models of calculators are forbidden, including the following: all Texas Instruments model numbers that begin with TI-89 and TI-92, as well as the TI-Nspire CAS (the non-CAS TI-Nspire is allowed); the Hewlett-Packard hp 48GII model and all model numbers that begin with hp 40G, hp 49G, or hp 50G; the Casio Algebra fx 2.0, ClassPad 300, and all model numbers that begin with CFX-9970G; and all electronic writing pads or pen-input devices, except for the Sharp EL 9600.
As mentioned previously, certain calculators can be used after extra features are disabled. Calculators that use paper tape, for example, may be used after the tape roll is removed. If the student has a model that makes sounds, disabling the sound feature makes the calculator acceptable for use during the test. For calculators that can communicate wirelessly, infrared ports must be covered with opaque material (such as electrician's tape or duct tape) of sufficient thickness to block infrared signals; the Hewlett-Packard hp-38G and hp-48G series are examples of this device type. Also, calculators with power cords must have the cords removed before they can be used during the exam.

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As for the coding itself, this site has a solid reference of many concepts and commands that are involved when programming for the TI-89: The best way to learn, however, is to play around and figure things out yourself. Programming for the TI-89 is much more powerful than it is for the previous TI calculators. Best of luck!

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Simple calculators usually only report errors for math operations that are not possible such as dividing by zero or if you hit equals when there is no number between a math symbol ( 3 ++ 4 = ERROR)
For more complicated calculators like the TI-89 an error can come up due to such mathematical errors and there is a lot of room for error with more complicated equations. Also there are programs in the calculator that if not done correctly will crash and cause an error.
The instruction booklet should have a list of common errors and how to avoid them. Look at the table of contents or the index to find such a list.

Good Luck hope this helps.

Mar 11, 2011 | Texas Instruments TI-89 Calculator

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