Don Williamson's Real-Time Web-Based DCPU-16 Emulator & ASM Code Editor

Don Williamson shared his real-time web-based code editor & interpreter for the DCPU-16 Virtual Machine. It makes nice use of the canvas tag for a beautiful blue console, features a real-time recompile as you type, and thanks to some custom DCPU-16 support for Marijn Haverbeke's wonderful CodeMirror syntax highlighting textarea library, it'll give you real-time error feedback as you type.

It also supports the dat instruction, to make it easy to store strings — something I haven't seen supported in any other web-based compiler so far.

Play with it here, or check out the source on git hub.