>>6There's a free emulator for Linux that works on a sufficiently old kernel and Xorg (I used Debian 4).
You can buy an open genera image but there's also one floating around which is exactly the same as the tarball you get when you bought C. 2010.
You need to setup your Linux environment correctly, but there are instructions for that (it's just a matter of running a time server IIRC).
Today, Genera by itself running emulated is (still) a useful programming environment.
If you can find any programs for it that's very good too but you might need to email some peeps and fork over some dough. Macsyma (*not* Maxima), Intellicorp's KEE and the Nichimen suite are, in many ways, still state of the art in their respective fields (sadly).