[sillywalk]

> Tandem's NonStop

I'd second this. Of course, there would need to be 3 emulators - the original proprietary CISC systems, the tightly-lockstepped MIPS systems, and the loosely-lockstepped Itanium systems.

HPE still sells NonStop on X86-64 systems now, including virtualized NonStop as a Service "cloud" offerings.

[rbanffy]

I would avoid those amd64 ones to not draw too much of HPE's ire. I might suggest even skipping Itanic.