HP-20S

HP-20S

The HP-20S is an algebraic programmable, member of Pioneer series of HP calculators produced from 1988 to 2003. It is similar to HP-21S. It has ninety-nine steps of fully-merged program and ten memory registers.

Libraries

There are six libraries in the ROM, which could be loaded to RAM and used and edited as user programs.

*A- [ROOT] finder, finds a root of f(x)=0
*B- [INT] integral, calculates definite integral using Simpson method
*C- [CPL] complex numbers manipulations
*D- [3 by 3] matrix manipulations and line equations solver
*E- [qUAD] quadratic equation solver
*F- [fit] curve fitting, using exponential, logarithmic and power functions

Design peculiarities

The HP-20S is not a clean design. It shares the quirks with its close relative, HP-21S. Some of them are:

*INPUT and SWAP keys, which are awkward and not clear solution to mimic RPN functionality.
*Absence of "x*A real bug is "x<=y" test. First of all, its name is misleading. Really, it is "x>=y" test in terms of RPN calculators. The manual says that "x" is 'hidden' while "y" is 'visible'. But "y""x" power key on the calculator's keyboards functions in the traditional fashion of other HP RPN calculators. The second problem here is due to algebraic design: in order to separate two arguments of a test you should divide them either with arithmetic operation or INPUT. If using arithmetic, like:

::RCL 6::+::RCL 7::x<=y?::GTO A

:you have "pend" announciator lighted, since calculator sees a pending addition operator. After the program stops, you can press "=" sign and get the result of pending operation. If you use INPUT instead of aritmetic operation, you'll see ":" anounciator. In order to hide this effect, you should place "C" clear command somewhere before program end.

Nevertheless, HP-20S is a functional and fast calculator, with very good LCD, keyboard, look, and feel. It uses the normal infix notation rather than RPN, which most HP scientific calculators use.

External links

*http://www.voidware.com/calcs/hp20s.htm
* [http://mycalcdb.free.fr/main.php?l=0&id=841 HP-20S] on [http://mycalcdb.free.fr MyCalcDB] (database about 70's and 80's pocket calculators)

Programming examples:

*http://www.hpmuseum.org/software/20stvm.htm Financial TVM calculations
*http://www.hpmuseum.org/software/20sbool.htm Boolean functions (AND,OR,XOR,NOT)
*http://www.rskey.org/detail.asp?manufacturer=Hewlett-Packard&model=HP-20S Gamma function


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