HP 39g+ Betriebsanleitung

hp calculators

hp 39g+

& hp 39g/40g

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

hp calculators

hp 39g+

& 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

hp calculators

hp 39g+

& 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

hp calculators

hp 39g+

& 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

•hp calculators

hp 39g+

& 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