copy/v86

v86 is a complete PC emulator that runs inside a web browser. An emulator is a program that mimics old or different hardware so you can run software designed for that hardware, in this case, it simulates an x86-compatible computer (the same architecture used by most Windows PCs for decades) entirely within a browser tab. The problem it solves: normally, running a different operating system requires dedicated hardware or a virtual machine installed on your computer. v86 lets you boot and run entire operating systems, including Linux, Windows 95, Windows 98, Windows 2000, FreeDOS, ReactOS, and many others, directly in a browser with no installation needed. How it works: the emulator recreates the physical components of a PC: a CPU, memory, keyboard controller, graphics card, disk controller, sound card, and even a network card. To make it fast, it translates the machine-level instructions for the emulated CPU into WebAssembly, a low-level language browsers run very efficiently. This translation happens in real time as the emulated software runs. You would use this when you want to demo an old operating system in a browser, build an interactive tutorial environment, test legacy software, or embed a live computing environment into a webpage without any server-side execution. Developers can also embed it in their own apps using the provided JavaScript library. The tech stack is JavaScript and Rust (compiled to WebAssembly), with an npm package available for bundler-based projects.