"Only text-based “standard I/O” DOS programs are usable in this environment, so if you run a program that switches to graphics mode or writes directly to video memory, don’t expect to see anything."
OK. Let's test some DOS-based develpment tools (e.g DJGPP) with it...
> pc.js makes no attempt to render characters at specific screen locations – it simply outputs characters in the same order that the machine displays them.
That's kindof a problem. Not many applications would work correctly like this.