HP 50g Graphing Calculator - Manual (Page 32)

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At the top of the display you will have two lines of information that describe the
settings of the calculator. The first line shows the characters:
R D XYZ HEX R= 'X'
For details on the meaning of these symbols see Chapter 2.
The second line shows the characters:
{ HOME } indicating that the HOME
directory is the current file directory in the calculator’s memory. In Chapter 2
you will learn that you can save data in your calculator by storing them in files
or variables. Variables can be organized into directories and sub-directories.
Eventually, you may create a branching tree of file directories, similar to those in
a computer hard drive. You can then navigate through the file directory tree to
select any directory of interest. As you navigate through the file directory the
second line of the display will change to reflect the proper file directory and
sub-directory.
At the bottom of the display you will find a number of labels, namely,
@EDIT @VIEW @@ RCL @@ @@STO@ ! PURGE !CLEAR
associated with the six soft menu keys, F1 through F6:
ABCDEF
The six labels displayed in the lower part of the screen will change depending
on which menu is displayed. But A will always be associated with the first
displayed label, B with the second displayed label, and so on.
Menus
The six labels associated with the keys A through F form part of a menu
of functions. Since the calculator has only six soft menu keys, it only display 6
labels at any point in time. However, a menu can have more than six entries.