Virtual machines and emulators have been around since the IBM 370 (at least). In my actual computing lifetime, the first real emulator that I remember was the 68000 emulator that Apple wrote when they switched the Macintosh to the PowerPC processor. Of course there have been plenty of emulators done since then.

So it really shouldn't have been a surprise that someone has done an emulator for the MIT CADR Lisp Machine. After all Symbolics Genera has been running on 64 bit Alpha's for quite some time now. Of course, there's a difference because you can go download the CADR emulator, and you can't do the same for Genera.

I wonder when someone will sit down and do an emulator for the Intel 432....