IBM Archives
IBM's own history site, with pages on many of their significant systems (see especially the "Exhibits" and "Documents" sections).
All about the IBM 1130 Computing System
The IBM 1130 Computing System, introduced in 1965, was IBM's most "personal" system to date. This site celebrates and documents that system.
Computing at Columbia Timeline
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 1620
Homage to the venerable IBM 1620 computer.
IBM 360/370/3090/390
A condensed history of IBM mainframes and their operating systems from System/360 through System/390.
IBM Advanced Computing Systems
A description of the first superscalar computer system - the IBM ACS project in the 1960s.
IBM Stretch
A brief description of the hardware parallelism of the IBM Stretch computer (also known as the IBM 7030).
Lawrence Wilkinson's IBM 360/30 Saga.
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.