HP codename, series  Monte Carlo, Pioneer 
Type, Precision, Input mode  Scientific, 12 BCD digits, exponent ±499, Algebraic 
Programmable  Yes, keystrokes, symbolic labels 09, AZ. 
Performance Index  
Memory  10 data registers (09), 99 program steps, permanent memory 
Dispay  12 digit 7segment LCD plus sign 
Special features  Probability functions, extended statistics, 6 builtin applications that can be loaded into program memory using the LOAD key: A: One sample test statistics, B: Two sample test statistics, C: Linear regression test statistics, D: Chisquare test statistic, E: Binominal probability distribution, F: Time value of money. 
Original Pricing, Production  3.1.1989 ($49.95)  approx. 1992 
Batteries  3x small button sized cells 
Dimensions  Length 14.7cm, Width 7.8cm, Height 1.5cm 
Links  
Comment  In principle a very powerful
machine  but the lack of the RPN entry
mode really makes things unintuitve. For example the big INPUT key: On
RPN machines this would be the prominent ENTER key but here it doesn't
have much functionality. It is only used to separate inputs for certain
functions that require two arguments, like permutation and
combinations.
So you ask why addition or substraction would not be a function of two
arguments? Well, right here the confusion begins! I tried "2 INPUT 3 +"
but the result was not what I had hoped for.
The same applies to the other algebraic models: HP10B, HP18C, HP19BII, HP20S and HP27S. The HP30S is different in a sense that it was originally designed as an algebraicentry model and didn't have to reuse the typical RPN style keyboard layout with the big ENTER key. The HP17BII and HP49G are different as well because they offer both RPN and algebraic mode. Interestingly, the algebraic models were introduced only in the later 1980s with the HP18C in 1986 being probably the first one. Also, half of these calculators are business/financial type models: The HP10B, HP18C, HP19BII, and to some extent the HP27S. A number of developments probably influenced this decision:

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