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3. Creating Your Own Program
Programmability and Definable Keys
Highly sophisticated calculations can be achieved by sequences
of keystrokes. Since the calculator is truly programmable, in-
cluding both branching and testing capability, it is quite possible
to set a program to iterate all night. Programs can consist of up
to 100 memory locations.
We have seen how the top row key functions can be defined to a
particular use by loading an appropriately prerecorded magnetic
card. Using a very simple example, we will now define the £}
key. We first plan the function, key it into memory, and then
test it. If it tests satisfactorily, we will record it on a magnetic
card for future use.
Planning the Function
The following key sequence computes x* (the cube of whatever
value k is in the X register).
T
z
k
Y
k|
k
k
k
X
k
k? k8
Key ¢+
¢+
X
x
Note: ENTER4 is here
abbreviated as
¢ .
To adapt the sequence to be a function that is callable by the
key, we precede the sequence by
B (c0 identify the func-
tion) and conclude the sequence by
(to return control to
the keyboard).
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