HP 35s Instruction Manual page 2

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HP 35s Introduction to the training aids
Use of the Training Aids
HP provides these training aids to help readers learn about the HP 35s, or to gain experience in its use. They do not
replace the manuals but offer a hands-on way to try some of the many HP 35s features. Readers who do not have an
HP 35s but wish to learn about it can benefit by studying these aids too. The training aids use no colors so they can be
printed on a black and white printer with no loss of information. The examples are provided purely for practice and do not
represent any real situations or people.
Special Symbols
The training aids use special symbols to show keys on the HP 35s and characters on the screen (also called the
display). The four cursor keys, up, down, left and right, are shown as ×ØÖÕ.
The yellow left shift key and the blue right shift key are shown as ¹ and º. Any other key pressed after one of
these two is called a "shifted key" and is shown as if the shifted function were an ordinary key. For example to get the
inverse sine function, called ASIN, it is necessary to press the yellow left shift key ¹ and then the k key. This
would be shown in the training aids as ºi. The special symbols at the top and the sides of the screen are called
"annunciators" and are shown as they appear, for example the right shift symbol à or the warning symbol â .
The HP 35s uses the letters A through Z as the names of variables. It uses the same letters as program labels. When a
key is pressed that needs a letter after it, the symbol A..Z is shown at the top of the screen. When this symbol is shown,
keys with letters to their lower right return those letters when pressed. The keys are then shown in these training aids as
the letters A through Z. Two other keys have extra labels, two labeled (I) and (J) are used for the special "index"
registers.
Some examples will show the way the screen looks while the example is worked through, as in Figure 1.
Figure 1
Special Key Combinations
There are a few special key combinations where two keys need to be held down at the same time. For example, if the
display is too dark or too light, it is possible to change the contrast. This is done by pressing and holding down the
Å
key (this is the key at the lower left of the keyboard, also called the key), then pressing repeatedly for a darker
Æ Ù
screen or for a lighter screen, with the key still held down. Once the contrast is suitable, both keys can be
à Å
released.
Other combinations of holding down the key while other keys are pressed also have special effects. The key should
Å
not be held down while another key is pressed unless a training aid says this needs to be done.
RPN and algebraic modes
The HP 35s has two calculation modes. RPN is the traditional HP calculation mode preferred by many experienced and
professional users. Algebraic mode is used on some newer HP calculators and on most other calculators. The HP 35s
allows users to choose either one, or to use both. Most of the training aids include examples in both modes.
hp calculators - 2 - HP 35s Introduction to the training aids - Version 1.0