Question about Texas Instruments TI-89 Calculator

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"Illegal Instruction" As long as the batteries are in my ti-89 titanium, on the very top of the screen it says "illegal instruction." The screen is ALWAYS on as long as the batteries are in. When I take them out, it turns off. When I put them back in, it gives me the "illegal instruction" screen without going to the main screen. The "2nd" "ALPHA" and "[diamond]" keys are the only ones that appear to function. No other buttons function when I press them, or at least they don't show that they do. Any solutions? Thanks, Mark.

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  • Ray
    Ray Oct 16, 2008

    I had the same exact problem. Thanks so much.

  • Anonymous Dec 11, 2008

    Yeah, me too. Thx!

  • Anonymous Jan 08, 2009

    And the solution worked! Thanks so much!

  • Anonymous Feb 17, 2009

    all my screen says is "illegal instruction" and "busy"

  • Anonymous Feb 23, 2009

    I had the same problem.  At the top of the screen, it said "Illegal Instruction."  The resetting solution worked like a charm.  Thanks.

  • wakeale87 Feb 25, 2009

    I have the same problem, and have tried doing the reset by holding the left button, right button, 2nd and On key and it still gives me the illegal instruction warning. I tried taking out the AAA batteries as well as the backup battery but whenever I install the batteries again I get the same message. Does anybody know if this can be fixed???

  • Anonymous Mar 05, 2009

    I had the same problem except the top of the screen said "address error". I used the best solution and it worked perfectly. Now the calculator is working again. Best of all it didn't erase any of my programs.

  • Anonymous Mar 25, 2009

    yeah it worked thanks big help



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If you and hold down simultaneously [2nd],[<],[>],[ON] it will get get rid of the message but will erase everything stored in ram. I had the same problem and this worked for me.

Posted on Dec 31, 2008

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Thank youu this fixed my problem as well.

Posted on Jun 15, 2009

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It sounds as though your calculator wil have to be reset, which will clear the RAM (erasing all unarchived data [including system variables], resetting all mode, graph, and table settings, and resetting the Clock). (I just hope you didn't have a lot of unarchived data!) To reset the calculator, hold down the left arrow key, the right arrow key, and the Second key; press and release [ON]; and then release the arrow keys and the Second key. That should do it!

Posted on Jun 12, 2007

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Hey guys, i had the same problem, two weeks ago, my solution was to remove the batteries (reserve and principals) for fifteen minutes, then i put it again and ready
this solution is 100% effective


this page is excellent
http://www.calculadoras.cl/foro/forumdisplay.php?f=2

Posted on Oct 13, 2012

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Take out all five batteries and put them back in so you don't have to reset

Posted on Jun 07, 2011

Thankyou so much for the solution to this problem.

Posted on Oct 19, 2008

Thanks

Posted on Oct 02, 2008

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