Question about Texas Instruments TI-83 Plus Calculator

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I can't see anything on my screen. Its all random numbers and stray marks

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Hello,
Press [2nd][QUIT] to interrupt any program stuck in memeory. Press [CLEAR] button to clear the screen.
Try adjusting the screen contrast.
Hope it helps.

Posted on Sep 27, 2009

  • k24674 Nov 06, 2009

    The behavior may be due to games installed in the calculator. Only you the owner know what is the machine. If this is due to a game hung in memory, you can remove the main batteries to force the game or program to shut down. Keep batteries out of the calculator for a while ( a few hours) then insert batteries and turn calculator back on again. You may have to adjust the contrast. To do so


    1. Press [2nd] key and release it.

    2. Press and Hold the [UPArrow]

    3. Keep Pressing until screen is dark enough.
    If that does not revive your calculator, you may have to follow the link to the TI FAQ and Knowledge Base to an article that addesses the question of a graphing calculator not turning on.

    Hope it helps.



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The post answer the question concerning how to generate random integers. The example given is for rolling a dice. I am inserting the modification that treats your case at the end.

The random number generator function is called Ran# and can be accessed in RUN mode by pressing:
[OPTN] [F6] [F3] (PROB) [F4] to access the (Ran#) function
In the paragraph above, the bold text in square brackets indicates keypresses, while the text in parentheses represents the menus that appear at the bottom of the calculator screen. This also assumes there are no menus on the bottom of the screen when you begin. If PROB is already on the screen, then the [F6] key is not necessary, just press [F3] then [F4] at this point.

The Ran# function generates a random decimal number between 0 and 1. If you need to generate a number with a higher range, then there may be extra steps involved. For example, to choose a random number between 0 and 100, you would enter:
Ran#×100 or Ran#(100)

ec9c0df.jpg
Let's say you want to simulate a dice roll, where you get an integer between 1 and 6. Your first step would be to do:
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This will give you a random decimal number between 0 and 6. But we need an integer, not a decimal. To make it an integer, you would change this to:
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Press [OPTN] [F6] [F4] (NUM) [F2] to access the (Int)

This now gives you an integer between 0 and 5. We just need to add 1 to the result.
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04419d1.jpg
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In the paragraph above, the bold text in square brackets indicates key presses, while the text in parentheses represents the menus that appear at the bottom of the calculator screen. This also assumes there are no menus on the bottom of the screen when you begin. If PROB is already on the screen, then the [F6] key is not necessary, just press [F3] then [F4] at this point.

The Ran# function generates a random decimal number between 0 and 1. If you need to generate a number with a higher range, then there may be extra steps involved. For example, to choose a random number between 0 and 100, you would enter:
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ec9c0df.jpg
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Press [OPTN] [F6] [F4] (NUM) [F2] to access the (Int)

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04419d1.jpg

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