Question about Texas Instruments TI-81 Calculator

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TI-81 manual Dad gave me his '81, and doesn't have the manual. He said I should be able to download it, but you only have a read in browser version. I need a download able version, as I have no way to reasonably transfer the whole manual page by page to my computer.

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  • Calc Ghost Nov 07, 2008

    I'm not the only one with this need either.

  • Anonymous Nov 26, 2008

    LINEAR rEGRESSION



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  1. Right click the link below
  2. Click Save-As
  3. Save to Desktop, or other location on your computer
  4. Enjoy

http://education.ti.com/downloads/guidebooks/graphing/81/81$bookeng.pdf

Posted on Nov 08, 2008

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1 Answer

How do I increase contrast on the screen (make it darker and easier to read)


Turn the calculator on. Press and then release the 2ND key. Press and hold the up-arrow key until the screen darkens to taste. If you go too far, use the 2ND and down-arrow keys to lighten the manual.

Apr 01, 2011 | Texas Instruments TI-81 Calculator

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My TI-81 screen is so faint. How do I make it


Turn the calculator on. Press and release the 2ND key. Press and hold the up-arrow key to darken the screen/increase the contrast.

Obviously, to go the other way you use the down-arrow key instead of the up-arrow.

Apr 23, 2010 | Texas Instruments TI-81 Calculator

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I have a TI-81 that stop working, I installed the


TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on at all. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.

Mar 16, 2010 | Texas Instruments TI-81 Calculator

1 Answer

I want to connect the calc to my computer. I have the connecting cable but not software. Can I download from somewhere?


Hi,
Any connectivity software for the Yexas Instruments cakculators is downloadable from the TI Support web site. Among the various versions available, I have not seen any relating to the TI81. However, it is possible that the TI Connect software can be used. I do not vouch for that. I have no TI81 to test it on.
Here is the link for all available connectivity software . If none works for you, I suggest you visit the ticalc.org archives. You might be lucky.

Hope it works

Nov 24, 2009 | Texas Instruments TI-81 Calculator

1 Answer

How do i convert decimals to fractions with my


Unfortunately, the TI-81 doesn't have this capability built-in.

Oct 29, 2009 | Texas Instruments TI-81 Calculator

1 Answer

I need to know how to convert decimals to fraction on my TI-81 texas instrument.


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Oct 23, 2009 | Texas Instruments TI-81 Calculator

1 Answer

How do i enter 35 degrees 20 minutes into my TI-81 calculator


As far as I know, the TI-81 doesn't have a degree-minute-second entry mode the later TIs have. But to answer your question, you can always do it as:
 35 + 20 / 60
followed by ENTER if needed.

If you're in Radian mode instead of Degree mode, you'd have to follow up with MATH 6 to specify degrees instead of radians.

Sep 29, 2009 | Texas Instruments TI-81 Calculator

1 Answer

Grandaughter gave me her TI-81. I replaced all


TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.

Sep 09, 2009 | Texas Instruments TI-81 Calculator

1 Answer

Ti-81 manual


Go to http://education.ti.com and search for the Guidebook.

Aug 27, 2008 | Texas Instruments TI-81 Calculator

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