HP 39gs Master Guide

Downloaded aplets & memory
As you can see in the screen snapshot on the previous page, my calculator has a number of extra aplets. Two
of them, Statistics2 and Statistics3 are simply copies of the normal Statistics aplet containing data that I did
not want to lose. The top two aplets Curve Area and Coin Tossing are teaching aplets that I have
downloaded from the internet.
If you use teaching aplets that you download from the internet via the
Connectivity Kit, or which are supplied to you by your teacher via the
infra-red link on an hp 39gs or the cable on an hp 40gs, then you need
to bear in mind that most of them have ‘helper’ programs that aid them
in performing their tasks.
In the screens shown right you can see some of the programs which are
attached to the two aplets mentioned above. The convention which most
programmers follow is to name these ‘helper’ programs in a way that
associates them clearly with the parent aplet. The memory associated
with these programs is not included in that shown for the aplet in the
APLET view but will not usually be a very large amount, as you can see
in the examples shown.
Calculator Tip
APLET view the ‘helper’
shared by other aplets.
APLET view.
Even on
The reason for this naming convention for ‘helper’ programs is that
when you delete the parent aplet in the
programs are NOT automatically deleted with it because they may be
You must change to the
Program Catalog
view and delete them manually after you have finished with the
teaching aplet and deleted it in the If you don’t do this
then they will continue to take up memory on the calculator.
the hp 39gs and hp 40gs this is not infinite and too many left over
programs will eventually cause problems.
As mentioned on the earlier, pressing
in the MEMORY
MANAGER
screen takes you to a relevent view showing greater detail.
For example, the Matrices entry right shows 0.1 Kb in use. Pressing
will take you to the MATRIX CATALOG view which shows
exactly where the memory is being used and allows you to delete any or
all of the matrices. Alternatively, you can enter the view in the normal
way by pressing
SHIFT 4.
The History entry will take you to the
HOME view, where pressing
SHIFT CLEAR will clear the History.
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HP 39gs Specifications

General

Type	Scientific
Form factor	Pocket
Product color	Gray
Internal memory	0.256 MB

Weight and Dimensions

Weight	249 g
Dimensions (WxDxH)	187 x 94 x 31 mm