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Function keys Can I set one of my "F" keys to open the calculator?

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Reset HP 17b11+

According to the manual:
To reset the calculator, hold down [CLR] while pressing the third menu key from the left. Repeat if necessary. The calculator displays
MACHINE RESET to confirm that reset has occurred.
The above sequence does not clear all memory and settings.

If you want to completely erase the continuous memory and return to default settings, press and hold down [CLR], the leftmost
menu key, and the rightmost menu key.(Press three keys simultaneously).
When the three keys are released, the calculator displays MEMORY LOST.

Apr 16, 2014 | HP 17bII+ Calculator

1 Answer

My calculator is blocked: the first window with all the apps is always displayed. i can't move from an application to another and when i get off/on the piles, the calculator get on and the same bug is...

The fact that the icons show on first screen is not a bug. It is a configuration setting.

Just in case some keys answer to a keypress.
Press the diamond key and the HOME key to get to the HOME screen. In Home screen press the MODE key. Use the Function keys (F1,F2,F3) to move to the last page of the configuration where you find the option Apps Desktop and toggle it to OFF. Press ENTER to save.
If that does not work (because the arrow keys) do not answer, try to RESET the calculator: Press [2nd][MEM] to open memory management then press F1 key to RESET. Try ressetting all RAM.
If more keys refuse to respond then maybe you should contact TI-cares at

Sep 09, 2011 | Texas Instruments TI-89 Calculator

1 Answer


To configure the calculator to do fractions, set the Input/Output mode to MathIO.
Press [SHIFT][MODE] to open (SetUp) then select [1:MathIO].
After you set it to MathIO, pressing the fraction key will display a fraction template where you can enter numerator and denominator as you would by hand (horizontal fraction bar). Also, the calculator will display results as fractions and radicals whenever possible.
To perform arithmetic operations on fractions use the regular operation keys (x, +, -, /). The calculator will perform the operations and display the results as fractions (whenever possible).

Aug 15, 2011 | Casio fx-300ES Calculator

1 Answer

Hi, I recently purchased a ti 89 calculator from a friend and I am having the following problem: The calculator will not evaluate trig functions. For example, if I type Sin(Pie/4) and hit enter, the...

The calculator is set up to produce exact results. If you want the expression to be evaluated put a decimal mark at the end of the 4.
to making 4 a floating point number instead of integer.
Alternatively, press the [MODE] key. Scroll down through the pages of options until you reach the line labeled Exact/Approx. When cursor is on that line, use the right arrow key to open the menu. Select [3:Approximate]. Press [ENTER] to save.

Aug 25, 2010 | Texas Instruments TI-89 Calculator

1 Answer

Canon P200 DHIII calculator needs to be changed the date. Can you tell me how?

Below are the steps to assist you in
setting the Date and Time on your calculator.

NOTE: The "Time Set", "AM/PM", "12/24" and "Format" associated keys are
on the faceplate above the respective key. Position the calculator so
that you can look directly over the keypad to see the notations.

Setting the date:

1. Press the CALENDAR/CLOCK Key. The default date will appear.

2. Hold the TIME SET key down for 3 seconds or until you see the first
digit begin to blink in the display.

3. Input the correct date.

4. Firmly press and release the TIME SET key. The first digit should
stop blinking and the date is then set.

Setting the time:

1. Press the CALENDAR/CLOCK key. The default time will appear.

2. Hold the TIME SET key down for 3 seconds or until you see the first
digit begin to blink in the display.

NOTE: The seconds will disappear.

3. Input the correct time. If you need to adjust to AM or PM, press
the AM/PM accordingly.

4. Firmly press and release the TIME SET key. The first digit should
stop blinking and the time is then set. The seconds will again be

Follow by pressing the CLEAR key to return to the calculator mode. To
return to either the TIME or DATE, press the CALENDAR/CLOCK key to
toggle between them.

Jan 22, 2010 | Canon P200-DHIII Calculator

1 Answer

I don't have the manual for my canon p23-dhv calculator. How so you set the date?

Hold down the time set key (M+ key) for 3 seconds. Then hit the date/time key. Enter in the correct date. Hit the time set key again to set. To set the time hit the date/time key twice to bring up the time.
Hope this helps.

Oct 30, 2009 | Canon P23-DHV Calculator

1 Answer


In case you haven't found the solution yet. This is it.
Move buttons to "Print" and "F"
Press CA key
Press % (set Key)
Press "time"
Press and hold down the % (set key) until the numbers come back and start flashing.
Put in the correct numbers.
Press % (set key) again and your done.
Hope this helps.

Dec 04, 2008 | Casio DR250TM Calculator

2 Answers

How do you set the tax rate?

press AC press and hold set key for2 seconds, until zero appears on the screen press tax+ input tax rate press set check by pressing AC, then pressing tax+ key. It should be the tax rate you inputed.

Aug 18, 2007 | Casio DF-120TV Calculator

2 Answers

Programming the Casio HR-100TE

Printing models (except HR-8TE): 1. Have calculator in ?print? mode 2. Press [CA] 3. Hold [SET/%] key for about 3 seconds 4. Input the tax rate 5. Press [TAX+] 6. Press [SET/%]

May 21, 2007 | Casio HR-100TEPlus Calculator

2 Answers

Unable to connect calculator to computer.

Try opening the software on your PC. Set the connection to USB and connect your calc. On the calc press the right shift key followed by the right arrow should now recognize the calc.

Mar 19, 2007 | HP 49g+ Calculator

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