TIL that many large banks, airlines, insurance companies, and government
agencies are still using IBM mainframes, a ~50 year old computing platform. In
fact mainframes still seem to be in active development: IBM announced
[https://fuse.wikichip.org/news/2659/ibm-introduces-next-gen-z-mainframe-the-z15-wider-cores-more-cores-more-cache-still-5-2-ghz/]
its new z15