[sillywalk]

I thought the Unisys mainframes have been running emulated on X86/X86-64 for a while? I assume they have some sort of binary translator.

[rahen]

Yes, you got it right. The Dorados now run a binary emulator on top of a microcomputer (x86_64) architecture, while IBM Z (itself essentially a 64-bit S390 arch) kept a mainframe configuration.