Texas Instruments TI-89 Calculator Logo
Mark Selim Posted on May 15, 2007

"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.

  • 6 more comments 
  • Anonymous 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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Anonymous

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  • Posted on Dec 31, 2008
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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.

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  • Posted on Jun 15, 2009
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Thank youu this fixed my problem as well.

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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!

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  • Posted on Oct 13, 2012
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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

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  • Posted on Jun 07, 2011
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Take out all five batteries and put them back in so you don't have to reset

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Anonymous

Thankyou so much for the solution to this problem.

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