DOS Wasm X vs js-dos

DOS Wasm X is a free, browser-based DOS emulator built around the DOSBox-X codebase and using WebAssembly. It provides virtual hard drive choices of 512 MB, 1 GB, or 2 GB and RAM choices of 32 MB, 64 MB, or 128 MB. The browser stores the drive so users can return later, and it can be exported as an image for local saving. Supported file types include ISO, ZIP, BIN, CUE, IMG, and 7z; users can import and export files and change a CD while the emulator is running. Controls include mobile mode, an on-screen keyboard, gamepad support, full screen, zoom, mouse capture, CPU speed and emulator time settings, and pause and resume. Audio, dark mode, and resolution resizing are also listed. Windows 95 or Windows 98 can be installed with the user's own Windows copy and ISO. The project can be hosted on a web server by copying the dist folder or run in a container using its Docker command. Before leaving after using Windows, shut it down within the guest system to save drive changes.

js-dos provides a JavaScript API and player for running DOS and Windows 9x programs in a browser or Node. It supports DOSBox and DOSBox-X backends, including Windows 95 and 98 system images through DOSBox-X. Developers can add the player to a webpage from its CDN, install it from npm, or download it from GitHub releases. A basic player needs static website hosting and no backend, but the page must be served over HTTP rather than opened with the file protocol. Browser IPX networking uses WebRTC-NET for IPX servers, peer and alias connections, and shared network instances. Game progress is kept in browser storage by default, which may be wiped; cloud saves can be enabled with a secret key. Custom save storage is supported through filesystem change hooks, and local persistence uses OPFS. All users can read sockdrive storage, while subscribers can write to it to save progress and install games. The site describes WebGL-backed 3Dfx rendering. Mobile support is marked production for v7 and work in progress for v8.