HP 20B - Manual (Page 14)

Basic Features
14
For more information about storing and recalling numbers, refer to the section titled, Storing and Recalling Numbers in
Chapter 2.
The Cash Flow and Statistics menus share the same memory and are limited to a combined total of 50 memory slots. The
number displayed with
Memory refers to the number of remaining memory slots. When the cash flow or statistics items are
displayed, a number also appears on the bottom line. This number indicates the number of memory slots used by the menu.
Pressing
I
with this number displayed resets the memory of the displayed menu item and erases all entered data.
Since entering data in these menus can represent a significant amount of work, you will be asked to confirm your choice. At
the Del.Data? or Del.CF? prompts, press
I
to confirm, or
O
to cancel.
Accessing Menus and Menu Maps
Many of the calculator's functions are located within menus. To access a menu, press the key, or secondary-function-key-
combination, for the menu in which you wish to work. To exit a menu, press
O
.
For example, to access the Break-even menu, press
:!
. Once opened, you can scroll through the items in the menu
by pressing
<
or
>
repeatedly. When you arrive at the last item in a menu, pressing
<
returns you to the first item.
Similarly, pressing
>
one time on the first menu item scrolls to the last item in the menu.
Most items consist of two parts: a name and an associated number. For example, the Fixed item in the Break-even menu
(Figure 7) displays as shown in Figure 5.
Figure 5
The large (=) annunciator shows that the value assigned to Fixed is 120,000 . If you perform a calculation with this item
displayed by pressing
1+2=
for example, Fixed is still selected as the current item, but the large (=)
annunciator is now turned off, indicating the 3 is not the value assigned to Fixed (see Figure 6).
Figure 6
At this point, to return to the display of the Fixed menu item shown in Figure 5, press
O
.
Some menus have sub-menus. If an item represents a sub-menu, pressing
I
with that menu item displayed opens the
sub-menu.