An in-depth look at mainframe computers, their 50+ year history, and the IBM mainframe, a business mainstay that represents most of the estimated 10,000 in use (Andrew Hudson/Ars Technica)

Andrew Hudson / Ars Technica:
An in-depth take a look at mainframe computer systems, their 50+ yr historical past, and the IBM mainframe, a enterprise mainstay that represents many of the estimated 10,000 in use  —  On this deep-dive explainer, we take a look at a big-business mainstay.  —  Mainframe computer systems are sometimes seen as historic machines—virtually dinosaurs.