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Overview System Requirements Related


42S is a Windows Phone port of Thomas Okken's excellent Free42, a complete re-implementation of the highly praised HP-42S RPN scientific calculator. Thomas' original code was written from scratch, without using any HP code or using any ROM images, yet it is fully HP-42S compatible. This calculator provides all the functionality of the original HP-42S including several hundred built-in functions, extensive programmability, and printer output emulation. Features: - RPN operation - Complex numbers - Real and complex matrix operations - Solver & numerical integration - Statistics - Base conversions and arithmetic - Programmable function keys - Extensive programmability for custom functionality. Existing HP-42S code packages can be leveraged for Engineering, Scientific, Financial, Statistical, etc functionality. Backward compatible with HP-41CX programs. - Internally stores values and performs operations in 25 digit decimal precision - Includes time & date functions based on the HP-41CV time module A trial mode is offered with the following restrictions: - Programs, registers and calculator state are not saved - One digit after the decimal point is displayed correctly with remaining digits struck out - Trial notice will pop up every two minutes Version 1.18 - Fixed bug where inserting END from catalog or XEQ "END" into a program caused app to crash. - Adjusted incorrect key sizing on 9 and divide keys Version 1.17 - Implemented program import and export functions using SkyDrive Version 1.16 - Increased key hit areas to include entire area surrounding key faces to prevent possible missed key presses. - Allow for large-size tile. Version 1.15 - Windows Phone 8 release - Fixed Lumia 920 and WP8 compatibility issues due to WP8 display event ordering - Adapted screens for multiple resolutions available in WP8 - Removed splash screen since WP8 has much faster startup times - Added WP8 app list icon transparency (gets theme color)


Additional information

Published by

Rayzzor Studios

Developed by

Rayzzor Studios

Release date


Approximate size

2.08 MB

Age rating

For all ages

This app can



Get this app while signed in to your Microsoft account and install on up to ten Windows 10 devices.

Language supported

English (United States)

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