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 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  —  In this deep-dive explainer, we look at a big-business mainstay.  —  Mainframe computers are often seen as ancient machines—practically dinosaurs.