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====== WP 43S Project ======

===== Introduction =====

A brain storming area for the development of the 43S calculator.  Just a collection of ideas and goals for the moment.  Everything is subject to change on a whim including the name.

===== Goals =====

To create the best ever RPN calculator.

    * A feature super set of the HP-42s.
    * A (mostly) feature super set of the WP 34S.

===== Technicalities =====

    * Proper alpha keyboard like the 34S or 41C series.
    * Menu based or XEQ alpha based -- there will be too many functions for the keyboard.  Maybe both menus and XEQ alpha.
    * Typed values like the 42s and later RPL machines.
    * Fully assignable keyboard with the 41C series hold to see function, keep holding to cancel.
    * Less cluttered keyboard than the 34S -- fewer shift keys, less overloading and complexity in the keyboard state engine and no hot keys.
    * Dynamic memory allocation.
    * I/O of some kind (serial, USB, SD).
    * Modular software design to allow independent development of (native) functions.
    * A less limited font -- sub and superscripts for every available character.

===== Data Types =====

    * Reals (decimal or binary or both?)
    * Long reals (again decimal or binary -- leaning towards binary here to make use of lots of existing libraries)
    * Integers (binary integers like the 16C/34S or unlimited precisions ones like the 50g or both?)
    * Strings
    * Complex numbers
    * Arrays (at least one and two dimensional, at least real and complex)
    * Fractions (i.e. exact rationals)
    * Intervals (?)
    * Quaternions (?)
    * Units

===== Hardware =====

    * Likely ARM embedded system on a chip based.
    * Lots more memory (flash and RAM) than the 34S (128kb & 2kb respectively).
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