This is an NC200 emulator running ZCN, with various programs and games available, which should respond to keyboard input. You could start by trying the commands "man man", "man index", "ls", "zcsoli", or "rogue". Control keys may confuse your browser, but ^C should be ok.
Note that changes are not saved, and the emulation runs locally in your browser. Some commands are not available, mostly due to the original ROM not being used.
The emulator is built with emscripten, using the musl libc and SDL2. See the credits page for details.