HP HP-65 - Figure 4-2. Control Operations for Defining Functions

Label (prefix). identifies its suffix (a digit [0],
...,[9], or top row key, ¥,..., @) as a label in a
stored program. A branch to the labeled part of the pro-
gram can then be done by executing followed by
the same suffix. For user-defined functions, the label
suffix must be a top row key (H,...,3).
B.68.8 .08, B3 Top Row Keys. These keys can be re-
defined by inserting a program into memory. When used
without a prefix, a top row key finds and executes the
corresponding user defined function.
|<—Window
. . <—Top Row
Default Functions. When the calculator is turned on, de-
fault functions as defined in the window above the top
row are automatically inserted into memory. [l
clears these functions so that alternate functions may
be keyed in.
Return. = If executed manually from the keyboard,
merely resets the program pointer to the top of
memory. = In a stored program, is the logical end
of a user defined function.
= If a function is executed from the keyboard, stops
the program.
Program
Stops the program
(leaves pointer here)
Stop
Figure 4-2. Control Operations for Defining Functions