> z/OS runs on IBM Mainframes, there is also “IBM i”, which was previously > called OS/400. > > Last I checked, GCOS-8 is still running, but with Itanium end-of-life, I’m > not sure what on. It’s been a niche market for decades. I’d argue that it > was a serious niche when I was using it in the early 90’s.
It is amazing how many people - IBMers included - that simply do not realize that Unisys exists, and both MCP and OS2200 are modern, up to date operating systems running on quite a lot of sites in the real world. -- Will
