WP 43S Project

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.

To create the best ever RPN calculator.

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

• 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.

• 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

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