Question about Texas Instruments TI-89 Calculator

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Illegal instruction Whenever i turn my calculator on all i see is the phrase "illegal instruction" and it is frozen at that screen. Does anyone know a way for me to fix this?

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  • Anonymous Mar 17, 2008

    my calculator is frozen and the illegal instruction label is on the top i cannot turn it on or off

  • Anonymous Mar 20, 2008

    illegal insurction

  • truman123 Mar 29, 2008

    My claculator is frozen and it says illegal instruction at the top of the screen and i replaced all of the batteries and it still says the same thing



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Try to take all the battries out including the back up battery and put them all back in and turn it on and see if that fxes it

Posted on Apr 11, 2007


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Posted on Jan 02, 2017


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