HP 30b HP 20b Business Consultant and HP 30b Business Professional User's Guid - Page 14
Annunciators, The Input Key, The Equals Key, Using the Input and Equals Keys - rpn
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Annunciators Annunciators are symbols that appear in the display as messages, or after certain keys or key combinations have been pressed. Annunciators are special symbols indicating a specific status in the calculator. Figure 3 illustrates the annunciator symbols in the display. Secondary function active Valid item for the Input key Valid item for the Equals key Assigned value Begin mode active Low batteries Number recall active RPN mode active Number storage Radians active 360 day-count calendar active active Figure 3 Annunciator Symbols in the Screen Display The Input Key I The key is used to input values for variables and execute menu items. I The key is also used in Reverse Polish Notation (RPN) mode to enter a number on the stack or duplicate it. The Equals Key = The key is used at the end of a mathematical operation to calculate the final result. For 1+2= example, returns a final result of 3. = The key, when pressed outside of a mathematical operation, also allows you to request a calculation for the value of an item. This request only applies to items that can be calculated. Using the Input and Equals Keys Suppose you wanted to calculate the effective interest rate for a 12% nominal interest rate with 12 payments per year in the Interest Conversion (IConv) menu. To open the IConv menu, press :&. Nom %= displays on the top line, and the current value assigned to the nominal 6 Basic Features