A condensed history of IBM mainframes and their operating systems from System/360 through System/390.

The IBM 1130 Computing System, introduced in 1965, was IBM's most "personal" system to date. This site celebrates and documents that system.

Homage to the venerable IBM 1620 computer.

A description of the first superscalar computer system - the IBM ACS project in the 1960s.

A brief description of the hardware parallelism of the IBM Stretch computer (also known as the IBM 7030).

Description of the resurrection of an abandoned IBM system 360 model 30 mainframe computer, stored in a warehouse, into a working machine, by a group of enthusiasts.

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.

IBM's own history site, with pages on many of their significant systems (see especially the "Exhibits" and "Documents" sections).