Nitpick: Almost 20 years ago IBM had the eclipz project to share technology between its POWER (System i and System P) and Mainframe (System Z) servers. I'm not

Nitpick: Almost 20 years ago IBM had the eclipz project to share technology between its POWER (System i and System P) and Mainframe (System Z) servers. I'm not sure if counts as "based on", but "the z10 processor was co-developed with and shares many design traits with the POWER6 processor, such as fabrication technology, logic design, execution unit, floating-point units, bus technology (GX bus) and pipeline design style."[0] The chips were otherwise quite different, and obviously don't share the same ISA. I also don't know if IBM has kept this kind of sharing between POWER & Z. [0] https://en.wikipedia.org/wiki/IBM_z10 https://en.wikipedia.org/wiki/IBM_z10