HP HP-67

Getting Started 39
A Word about the HP-67
Now that you’ve learned how to use the calculator, you can begin to
fully
appreciate
the
benefits
of
the
Hewlett-Packard
logic
system.
With this system, you enter numbers using a parenthesis-free,
unambiguous method called RPN (Reverse Polish Notation).
It
is
this
unique
system
that
gives
you
all
these
calculating
advantages
whether
you’re
writing
keystrokes
for
an
HP-67
program
or
using
the
HP-67
under
manual
control:
= You never have to work with more than one function at a time.
The HP-67 cuts problems down to size instead of making them
more complex.
= Pressing a function key immediately executes the function. You
work naturally through complicated problems, with fewer key-
strokes and less time spent.
= Intermediate results appear as they are calculated. There are no
‘“‘hidden’’ calculations, and you can check each step as you go.
= Intermediate results are automatically handled. You don’t have
to write down long intermediate answers when you work a
problem.
= Intermediate answers are automatically inserted into the prob-
lem on a last-in, first-out basis. You don’t have to remember
where they are and then summon them.
= You can calculate in the same order that you do with pencil
and paper. You don’t have to think the problem through ahead
of time.
The HP system takes a few minutes to learn. But you’ll be amply
rewarded by the ease with which the HP-67 solves the longest most
complex equations. With HP, the investment of a few moments of
learning yields a lifetime of mathematical dividends.