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From IBMs computer history page:
Until the early 1960's, every computer model was generally designed indepedently, and sometimes individual machines were custom modified for a particular customer.
IBM changed this forever, when they announced the IBM-360 family of computers in April 1964.
The IBM-360 family of computers ranged from the model 20 minicomputer (which typically had 24 KB of memory) to the model 91 supercomputer,
which was built for the North American missile defense system.
Despite their differences, all these machines had the same user instruction set.
The original 360 family was announced in 1964, and the lower midrange model 40 was the first to ship a year later.

October 2009

Pics from visit to the Computer Museum, Mountain View, CA. - Visible Storage display items.