I don't think hardware is the limiting factor -- OS/400 runs on a pretty standard RISC platform, same POWER chips that run AIX and Linux. Has some special tagge

I don't think hardware is the limiting factor -- OS/400 runs on a pretty standard RISC platform, same POWER chips that run AIX and Linux. Has some special tagged memory extensions, but nothing too radical, and not a hard requirement for a system like it. The hard part is developing software to use it. I don't think you can really port existing OSes and software to use a single-level store environment. It's a different language than the one we speak. Seems this has been a general problem for persistent memory, to really use it 100% you need new software designed for it.