HP 30b HP 20b Business Consultant and HP 30b Business Professional User's Guid - Page 24
Levels 1 and 2 equal. See In the example above, pressing
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Table 2-3 Simple Arithmetic Calculations in RPN Mode Keys Display 3I4 + 5I6 + * Description RPN Stack Inputs the numbers and the operation in the first set of parentheses. Intermediate results are displayed. Note the (+) and (RPN) annunciators. Previous Value Previous Value Previous Value 7 Inputs the numbers and the operation in the second set of parentheses. Intermediate results are displayed. Note the (+) annunciator. Previous Value Previous Value 7 11 Finishes the operation and displays the results. Previous Value Previous Value Previous Value 77 I = Pressing or when you are not entering a number duplicates the number on Level 1. That is, the number on Level 1 is pushed on the stack, making Levels 1 and 2 equal. I * In the example above, pressing after duplicates 77 on the stack, making Levels 1 and 2 equal. See Figure 5. 16 Mathematical Calculations