rysasahrialFree42 is a comprehensive, open-source reimplementation of the Hewlett-Packard HP-42S scientific programmable calculator. Developed by Thomas Okken, this simulator replicates the functionality of the original HP-42S, offering users a reliable and versatile tool for complex calculations.
The Free42 source code is freely available on GitHub, allowing developers and enthusiasts to build, modify, and enhance the simulator according to their needs. Written from scratch, Free42 does not rely on any HP code or ROM images, ensuring a clean and legal foundation for development and distribution.
One of the standout features of Free42 is its cross-platform compatibility. The simulator can be built for various operating systems, including Windows, macOS, Linux, Android, and iOS. This flexibility ensures that users can access a consistent and powerful calculator experience, regardless of their preferred platform.
Free42 supports both binary and decimal floating-point arithmetic. Users can choose the mode that best suits their precision requirements. For instance, the Windows, macOS, iOS, and Android versions offer separate targets for decimal and binary builds. On Linux, the selection is managed via the BCD_MATH environment variable.
Building Free42 from source is straightforward. For example, on a Raspbian 10 system, users can install the necessary dependencies using apt, clone the repository, navigate to the appropriate directory, and execute the make command with suitable flags. This simplicity encourages experimentation and customization among developers.
The Free42 project also includes resources such as skins and programs to enhance the user experience. Users can customize the calculator’s appearance and functionality to match their preferences or specific use cases.
For those interested in contributing to the project or exploring its capabilities, the Free42 GitHub repository provides comprehensive documentation, including build instructions and historical context. The community around Free42 is active and welcoming, making it an excellent project for both seasoned developers and newcomers to open-source software.
In summary, Free42 offers a powerful, customizable, and legally sound alternative to the original HP-42S calculator. With its open-source Free42 source code, cross-platform support, and active community, it stands as a valuable tool for anyone requiring advanced scientific calculation capabilities.
