Old IBM mainframes and minicomputers manufactured before 1980.
Summary of Columbia University's dense, more than 50-year-long history of academic use of IBM systems. Includes links to descriptions of most of the systems they have used.
A condensed history of IBM mainframes and their operating systems from System/360 through System/390.
A description of the first superscalar computer system - the IBM ACS project in the 1960s.
IBM's own history site, with pages on many of their significant systems (see especially the "Exhibits" and "Documents" sections).
A brief description of the hardware parallelism of the IBM Stretch computer (also known as the IBM 7030).
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