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24. Jan 2018
Reverse Polish Notation
While the hp 33S is capable of both Algebraic and Reverse Polish Notation (RPN) entry, it is the capability of RPN logic that gives this Hewlett Packard Calculator its extraordinary calculation ability. With the automatic 4-register stack, a feature since the beginning of RPN, calculation results are shown as soon as a function button is pressed. It is in this manner that the results of all intermediate calculations may be viewed. Beside being a standard calculator, the HP33S is programmable. It has numerous numeric-memory-registers in which to store data, as well as a fairly sizable program memory, and the numeric-memories are accessible under program control. It has statistical abilities and well as all the normal scientific and engineering capabilities. It also has the ability to work with fractions. In short, it is truly an extraordinary calculator. – Written by Michael H. Keehn