Good Gear Guide
In pictures: The (mostly) cool history of the IBM ...
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.
In pictures: The (mostly) cool history of the IBM mainframe