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Introduction 11
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Sample Case: (12 × 5) + (11 × 4) + (10 × 3) = ?
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Press
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See Displayed
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12 ENTER 5 ×
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11 ENTER 4 × +
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10 ENTER 3 × +
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More Computing Power
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The calculator also has nine addressable registers so that the calculator can hold intermediate results or
frequently used constants. This means that calculations of considerable complexity can be performed without
reentering data or intermediate results. You now have some practice in calculating manually. We will consider
these registers and further capabilities for manual calculation in the body of this handbook. In the meantime,
let us move on to the question of running a prerecorded program.
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2. Running a Prerecorded Program
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A built-in magnetic card reader/writer allows a program to be permanently preserved on magnetic cards for
future use. By reading such a card, your general purpose calculator gains a highly specific capability in a
matter of seconds. Some users may wish to use professionally programmed cards without themselves doing any
programming.
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Irrespective of your major interests, we think that you may find a use for the Personal Investment Program,
the first program in the Standard Pac shipped with your calculator. You will find the prerecorded magnetic
card for this program in the card case, along with 18 additional programs, a head cleaning card, and 20
blank cards for recording your own programs.
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The programs vary from general to specialized. Some programs were selected from other pacs available
through HP. For example, the Pi Network Matching Program is from the EE Pac I, the Mean and Standard
Deviation program is from the Stat Pac, etc. As leisure permits, you may wish to familiarize yourself
with them all and work the numerical examples. The Personal In vestment Program, however, is from no
other pac. It was created for you, to allow you to calculate the growth of a regular monthly
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