I didn't mean equivalent to a lisp machine, just equivalent to the submission in the lisp machine direction.

Can you go into a little more detail, or point me to a more in-depth personal account of using Genera?

I would not put every Lisp implementation into the context of a Lisp Machine with a Lisp operating system. A Lisp in a browser with some features like files and threads is something different from a computer, a piece of hardware, which actually boots into Lisp. Also Genera, the OS of the Symbolics Lisp Machine, is a complex piece of software, which was based on the work of many person-years. It was also developed over a decade and sold commercially in several releases for several generations of hardware.

As such a Lisp environment in a browser is a nice achievement and it looks like a fun project. Naturally it is far away from a really sophisticated system like Genera. Still, it is interesting to write something like this small project. Though I would prefer something which would be compatible with Common Lisp and would allow reuse in that direction.

If people would want to know more about Genera, the operating system, the Wikipedia article is a good source. If there is something missing, we should add it.

Kalman Reti (who worked for Symbolics for many years) gave a presentation: http://kvardek-du.kerno.org/2013/03/kalman-reti-on-lisp-mach...