Manufactures and markets mainframe connectivity and data movement products, both under their own brand name and as an OEM.

Article by Patrick Mullenon on IBM announcing 64 bit architecture.

Covers mainframe hardware and z/OS-related systems software topics. Including a collection of IBM Green Cards.

Links to P/390 information and z/OS freeware, as well as Gilbert's own z/OS tools and documentation.

Large collection of categorized links covering IBM mainframe hardware and software topics, with special emphasis on the needs of systems programmers.

Access to over 30 Web sites run by individuals interested in mainframes.

Tom Van Vleck's history of the IBM System/360 Model 67 computer and the CP/CMS operating system, which later became z/VM.

1964 article coinciding with the announcement of the System/360 (S/360), the first family of computers to have the same machine architecture as IBM mainframes of today. Written by the S/360's architects: Gene Amdahl, Gerrit Blaauw and Fred Brooks.

A personal history of the IBM mainframe by Lars Poulsen.

Special type of less formal IBM manuals. Useful for users seeking more real-world examples than given in standard manuals. Usually details implementation and experiences of a project to implement IBM software and hardware, but some are conference presentation material. More often now, a few are introductory textbooks on a specific technology: IBM hardware or software product.