HP 39g+ Operation instructions

hp calculators
hp 39g+
& hp 39g/40g
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ClearingYourCalculator
The purpose of this section of the tutorial is to
illustrate how to examine and manipulate
memory and how to reset the calculator.
•Restoring default values
•How to reset your calculator
•Checking memory use
•Clearing the HOME history
•Clearing other views
The materials presented on this page are adapted from material published by Applications in Mathematics. Materials presented on this page are licensed exclusively to
Hewlett-Packard Co.(“HP ”) by Applications in Mathematics, solely for viewing in this form and on this HP web site. Printing, reproduction or re-transmission in any other form
or venue is prohibited. ©2003 Applications in Mathematics. All rights reserved.

hp calculators
hp 39g+
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& hp 39g/40g
Restoring default values
The default values in an aplet or a view can be restored in a number of ways.
1. Reset an aplet
In the APLET view, highlight an aplet and press
the RESET button (screen key 2). This restores
default values and clears any data or functions
which may have been entered.
2. Reset a single view
If you just want to reset the default values for a
single view then press SHIFT CLEAR.
Highlighting a single value and pressing DEL
will reset a single field.
The materials presented on this page are adapted from material published by Applications in Mathematics. Materials presented on this page are licensed exclusively to
Hewlett-Packard Co.(“HP ”) by Applications in Mathematics, solely for viewing in this form and on this HP web site. Printing, reproduction or re-transmission in any other form
or venue is prohibited. ©2003 Applications in Mathematics. All rights reserved.

hp calculators
hp 39g+
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& hp 39g/40g
How to reset your calculator
There are a number of reasons why you might wish to do this. As well as allowing you
to restart it if an aplet or a program has caused problems, it is a quick and easy way to
clear out all data and set everything back to default values. With a calculator as
complex and powerful as the hp 39g+ it is possible for the operating system to ‘hang’.
A reset will always fix this if it should happen. It is not possible to damage the
calculator through using an aplet or a program. A reset will always fix any problems.
There are two types of reset – a soft reset which does not cause data loss, and a
hard reset which does.
•Performing a soft reset can be done in two ways. Hold down the ON button and
then, while still holding it down, press screen key 3. When you release both
buttons the screen will very briefly flash a copyright notice. Afterwards you should
find that you are back in the HOME view. The HOME history will be cleared but
no data should be lost under normal circumstances.
The other method is to poke a pin or paperclip into the hole on the back. The
screen will blank. Press ON and a soft reset will be performed.
•Performing a hard reset will cause all data to be lost and also cause all aplets to
reset to factory defaults. It is not possible to delete the original aplets as they are
built into the chip.
A hard reset is done by holding down the ON button and,
while still holding it down, pressing screen keys 1 & 6
together. Release screen key 6, then screen key 1,then
ON. You should find that you are back in the HOME view with the message
shown right. Press OK. It is not actually offering a choice – the memory has
already been cleared and there is no going back!
The materials presented on this page are adapted from material published by Applications in Mathematics. Materials presented on this page are licensed exclusively to
Hewlett-Packard Co.(“HP ”) by Applications in Mathematics, solely for viewing in this form and on this HP web site. Printing, reproduction or re-transmission in any other form
or venue is prohibited. ©2003 Applications in Mathematics. All rights reserved.

hp calculators
hp 39g+
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& hp 39g/40g
Checking memory use
The amount of memory remaining is shown at the top right of
the APLET view . The original amount is 234Kb, which is
more than enough for any normal use.
As more memory is used the calculator may slow down slightly but this is usually only
noticeable when memory usage rises to exceptional levels.
To check the memory allocated to the various different
categories press SHIFT MEMORY. To give a rough idea of
the capacity of the calculator, the 5.5KB shown right is entirely
due to a simulation of 1000 rolls of a dice stored in the
Statistics aplet. Clearly a great deal of data can be stored.
Pressing VIEW (screen key 6) for
any category will take you to that
view for further detail. Individual
elements can be deleted there.
The materials presented on this page are adapted from material published by Applications in Mathematics. Materials presented on this page are licensed exclusively to
Hewlett-Packard Co.(“HP ”) by Applications in Mathematics, solely for viewing in this form and on this HP web site. Printing, reproduction or re-transmission in any other form
or venue is prohibited. ©2003 Applications in Mathematics. All rights reserved.

•hp calculators
hp 39g+
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& hp 39g/40g
Clearing the HOME history
Every calculation performed in the HOME view is remembered until erased. Although
the hp 39g+ has an abundance of memory available it is always advisable to clear the
history periodically. This can be done very easily by pressing SHIFT CLEAR in the
HOME view.
Clearing other views
The hp 39g+ has a multitude of views to contain the
various different objects such as matrices, lists, aplets,
programs and notes. Each of these except the APLET
view can be cleared using SHIFT CLEAR. Individual
elements can be deleted using DEL.
In the APLET view, pressing SHIFT CLEAR will, as expected, delete any e-lessons but
will not clear data from the built-in aplets. To do this you must highlight each in turn
and press the RESET button (screen key 2).
Tip: Most e-lessons come with a small set of support prog-
rams which are stored in the Program Catalog. When the
e-lesson in the APLET view is deleted these support
programs are not automatically deleted with it. You must
change into the Program Catalog view and delete each
of the supporting programs by hand. Generally they will
be named so that it is clear which e-lesson they belong to.
For example: The Curve Areas e-lesson is shown right
with its support programs. These programs all begin with
“.CUR” to show they are not independent programs.
The materials presented on this page are adapted from material published by Applications in Mathematics. Materials presented on this page are licensed exclusively to
Hewlett-Packard Co.(“HP ”) by Applications in Mathematics, solely for viewing in this form and on this HP web site. Printing, reproduction or re-transmission in any other form
or venue is prohibited. ©2003 Applications in Mathematics. All rights reserved.