Classic PC demoscene productions running natively in the browser

A project that runs classic PC demoscene productions natively in the browser, presenting a menu of preserved demos such as Unreal (Future Crew, 1992), Second Reality (Future Crew, 1993), Crystal Dream II (Triton, 1993) and Stars: Wonders of the World (NoooN, 1995). Each demo’s original loaders, music players and effects execute exactly as they did on original hardware; the original release files are served unchanged. The interface mimics retro BBS aesthetics, includes credits, and tracks visits anonymously without IP logging or tracking cookies.

Execution is achieved by recording every block of x86 code the demo actually executes on an emulator, translating those recorded instructions one-for-one into C with exact cycle timing, and compiling that C to WebAssembly alongside precise models of the hardware the demo talks to (timer, VGA, Sound Blaster). The compiled result is verified event-for-event against the emulator - matching interrupts, port accesses and video frames at the same emulated times. The work demonstrates faithful, cycle-accurate reproduction of complex DOS demos in modern browsers; visual smoothness is best on displays running 70 Hz (or integer multiples). Source and additional details are available on GitHub.