DOS Wasm X vs UniPCemu

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.

UniPCemu is a free, downloadable x86 emulator for classic PC software. Its main listing covers Windows and Android, with additional builds mentioned for PSP, Nintendo Switch and PS Vita. The emulator models CPU generations from the 8086/8088 through Pentium II, and drivers can provide software floating-point emulation. Hardware choices are configurable: graphics range from IBM MDA to ET4000/W32 SVGA, while sound options run from the PC speaker to Sound Blaster 2.0. It supports MS-DOS targets, DSK, IMD, CUE, IMG and IMA disk images, gamepads, audio CDs, mouse and keyboard, PSP-style controls and touch input. Windows MIDI passthrough is available. Windows server builds can use TCP to simulate SLIP or PPP connections, with multi-client and protocol support plus IP-based access controls. Android data is not backed up automatically and may be deleted on uninstall. Users provide ROMs and disk images. Windows server builds require WinPcap-compatible software.