To build the Calculator app, you’ll need a Windows 10 computer and Visual Studio. You might think that this is the same code that’s been shipping for 30 years — it’s a simple calculator ...

Microsoft is making available the Windows Calculator source code, build system, tests and roadmap as open source under an MIT license.

To accompany the hardware, ChromaLock developed custom software for the microcontroller and the calculator, which is available open source on GitHub. The system simulates another TI-84, allowing ...