HP HP-67 - Page 25

Meet the HP-67 21
Your Own Program
Earlier, you calculated the surface area of Ganymede, one of Jupiter’s
12 moons. Now, if you wanted the surface area of each moon, you
could repeat that procedure 12 times, using a different value for the
diameter d each time. An easier and faster method, however, is to
create a program that will calculate the surface area of a sphere
from its diameter, instead of pressing all the keys for each moon.
To calculate the area of a sphere using a program, you should first
create the program, then you must load the program into the cal-
culator, and finally you run the program to calculate each answer.
If you want to save the program, you can record it permanently on
a magnetic card.
Creating the Program. You have already created it! A program is
nothing more than the series of keystrokes you would execute to solve
the same problem manually. Two additional operations, a label and
a return are used to define the beginning and end of the program.
Loading the Program. To load the keystrokes of the program into
the calculator:
Slide the W/PRGM-RUN switch wrrcwm [[[Illrun to W/PRGM
(program).
Press to clear the calculator.
CLPRGM
Press the following keys in order. (When you are loading a program,
the display gives you information that you will find useful later, but
which you can ignore for now.)
Defines the beginning of the program.
. These are the same keys you pressed to solve the
o (=)
problem manually.
Defines the end of the program.
The
calculator
will
now
remember
this
keystroke
sequence.