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HP 9g Clearing, Editing and Correcting
This learning module describes how to reset the memory and clear data, as well as the different techniques for editing
the entry line and correcting errors.
Resetting and clearing memory
Pressing ~ Ý displays the message RESET: N Y. If you now press † and = the entire user memory is cleared
and the message "MEM CLEARED" is displayed. All variables, programs, pending operations, statistical data, answers,
previous entries will be lost. Press =or : to cancel the reset operation.
Whenever the calculator does not respond to keystrokes, the reset operation described above is not possible. In such
case try pressing the , and ` keys at the same time. This procedure should unblock the calculator and all settings
will return to their default values. Unlike a soft reset or a warm start on the HP 49, all memory is cleared by the ,-
` key combination, just like the above procedure.
Graphs are cleared by pressing ~ T (the right arrow key). Programs are cleared in the PROG mode (MODE 3):
when the PROG menu is displayed select DEL and press = or just press 3. A new menu is displayed with three
options: ONE to clear only one program (which is selected form the non-empty programs present in memory), ALL to
clear all the programs and EXIT to exit this menu without clearing any program. Before clearing either one or all the
programs, a confirmation menu is displayed. Statistical data can be deleted by selecting D-CL and pressing ENTER in
the STAT menu (`1, select D-CL and =). All data sets will be lost.
A variable can be individually cleared by storing 0 in it. This same technique can be applied to more the one variable in a
step:
Example 1: Clear variables A through F
Solution:
0AAWXF
Notice that the Alpha indicator is automatically set after pressing A.
Answer:
0. Press ~a to review the values of the variables.
In order to clear all the variables at once, press ~Ö. Please be warned that no confirmation message is displayed.
The running memory M is cleared by pressing the { key twice in a row. Refer to the HP 9g learning module Using
Memories to Solve Problems for more information on the running memory and the standard memory variables.
Editing and correcting the entry line
The keys used to edit the entry line are the left and right arrow keys: „ and † that make the blinking cursor move to the
left or to the right respectively. Holding these keys down make the cursor move quickly. The cursor is always in "insert"
mode, that is, a newly keyed in character does not overwrite the existing one. To move to the beginning or the end of
the line press Wq and Wt respectively.
The well-known ~ key is used to enter or execute a function with a yellow label. The 2nd annunciator appears in the
display indicating that the next key you press will be a yellow key. This is the way nearly all calculators work, but what is
less known is that the HP 9g has a way to lock the ~ key: press W~ and not only one but all the next key
presses will be selecting the second functions. This special mode can be stopped by pressing the ~ key again.
hp calculators
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HP 9g Clearing, Editing and Correcting - Version 1.0
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