First a word about key codes. When you enter a key sequence
into the calculator while in “W/PRGM” mode, you will see
up to three 2-digit numbers in each instruction line. For
example: 31 25 11.
Each of these is a row/column code that maps to your
keyboard. “31” means row 3 column 1 - which is the “f”
shift-key, and so-forth for “25” and “11”.
The one exception is the digit keys. These will be the actual
value such as ’01’ for the 1 digit, ’09’ for the 9 digit. Since
there is no row “0”, this doesn’t interfere with the other key
codes, and it makes reading the program a little easier, as
numbers are simply the values you enter. However it takes
one line per digit, so try to store large numeric constants in a
register to keep your programs shorter.
Your Own Program
Now let’s try something a little more involved. To calculate
the surface area of a sphere, the formula A = πd2 can be used,
where:
• A is the surface area of the sphere,
• d is the diameter of the sphere,
• π is the value of pi, 3.141592654.
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