In pictures: The (mostly) cool history of the IBM mainframe

IBM's iconic mainframe turns 50: In its history the IBM mainframe has been hailed and vilified. It has been born, reborn (many times) and pronounced dead. And yet the Big Iron remains a key computing resource for many large companies and will do so for many years. Here we take a look at the mainframe’s long history, from its use with the US space program to its prominence inside large business datacentres. Take a look.

The Model 145 of 1970 was the first IBM computer using a main memory made entirely of monolithic circuits. To store its data and instructions, the 145 used silicon memory chips, rather than the magnetic core technology that had been the mainstay of computer memories since the mid-1950s.

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