HP HP-65 - Introduction; Three Ways to Use the HP-65

Introduction
Three Ways to Use the HP-65
Congratulations on purchasing your HP-65 Programmable
Pocket Calculator. In addition to all the computational capa-
bilities that have made the earlier HP-35 and HP-45 models so
popular with professional people, your new HP-65 offers a fea-
ture that no other pocket calculator can provide: true program-
mability.
Simply defined, programmability is the HP-65’s ability to learn,
remember, and automatically execute the keystroke sequence
required to solve a particular type of problem. The value of this
feature becomes clearer when we consider that most of us who
routinely work with numbers spend a great deal of time doing
the same types of calculations over and over again. No matter
whether we're preparing flight plans, surveying construction sites,
calculating returns-on-investment, or designing power supplies,
we can all identify repetitive, time-consuming problems which
diminish our productivity and frustrate our goals.
Although programmable computers and desk-top calculators
have been available for some time, their expense, complexity
and non-portability have made them inappropriate or impractical
for many tasks. The real significance of the HP-65 is that it
overcomes these limitations and lets almost anyone enjoy the
advantages —speed, accuracy, convenience —of a programmable
calculating device.
You can use this powerful device in three ways:
1. To Calculate Manually
You control every step of the calculation by pressing keys in the
actual order of execution: you enter data, perform functions,
store results, control display, etc., by pressing keys.
2. To Run a Prerecorded Program
By using prerecorded magnetic cards (like those supplied in the
Standard Pac shipped with your calculator) you can do highly
complex calculations with minimal effort or study of the calcu-
lator itself. You load a card into the calculator and let the stored
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