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## HP 20b Calculator - Accessing Menus

Many of the 20b calculator's functions are located within menus.
There are four types of menu items:
• Read/write: These items, such as 'Fixed' in the 'Break-even' menu, are easily recognizable, because when they are selected, both the 'INPUT' and small (=) annunciators are lit. When lit, these annunciators indicate that entering a number and pressing will store the entered number in the displayed menu item. Pressing (outside of a mathematical operation) calculates the value for that item based on available data.
• Read-only: These items, such as Internal Rate of Return (IRR%) in the IRR menu, are display-only. They are calculated values computed internally by the calculator.
• Write-only: These items, such as investment interest rate (Inv. I%) in the Net Present Value (NPV) menu, are similar to read/write items in that the 'INPUT' annunciator is lit when these items are selected, indicating that entering a number and pressing stores that number in that menu item. However, the key does not calculate a value for that item.
• Special items: These items, such as the Degree/Radian option in the 'Mode' menu, the items of the 'Reset' menu, and the items of the Percent Calculation ('% calc') menu, perform an action when is pressed. Depending on the menu, this action can be the selection of a sub-menu ('%calc' menu), changing a mode or setting ('Mode' menu), or erasing data ('Reset' menu).
##### note:
To access a menu, press the key, or secondary-function, key combination, of the desired menu. To exit a menu, press .
For example, to access the 'Break-even' menu, press . 'Fixed' is displayed. To scroll through the items in the menu, press and repeatedly. Upon arriving at the last item in a menu, press to return to the first item. Similarly, pressing one time on the first menu item scrolls to the last item in the menu.

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