August 2021
T90 & C90 mini movies and T3D videos
This collection of movies was distributed on a sales related CD and demonstrated some of the tasks that T90s and other Cray supercomputer systems performed. These are in Quicktime.mov format and are of low resolution which was normal for the time. Enjoy. Mini movie Bucket or T90 and C90 Mini movies Note: You may
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Cray Floating point numbers
The representation of floating point numbers and the “accuracy”, repeatability and reversibility of arithmetic operations has long be a topic of discussion amongst Cray customer and scientific users. The Cray machines up to the C90 range used 64 bit Cray floating point arithmetic. When representing the long smooth curve of real numbers using digital bits
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Cray System Service snapshots 1989 and 1996 with remote support information.
When you pay a few million $£€ for a supercomputer you expect great service. Here are a couple of service snapshots: An article about the introduction of the on-site module tester for XMP boards. From Volume 6 No 1 – Jan/Feb 1986 of Cray Interface The on site testing and repair procedures are described
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Links to Videos of Interest
A few links to videos of interest to Cray-History visitors. Most of these are created by the Computer History Museum. What’s All This About Gallium Arsenide?, lecture by Seymour Cray at Super computing 1988 includes industry history. The CRAY T3D Massively Parallel Processing System, lecture by Stephen Nelson and Steven Oberlin Cray Research – A
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Cray press release listing
The site has a couple of collections of public press releases available here. The first set covers 1993 to 1996 and the second set from March 2002 to Feb 2008. Lets us know if you can fill in the gaps. All documents were obtained from publicly available sources. 1993 to 1996 List CEA_ORDER.950424.txt
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Unicos and other operating systems
Unicos is the operating system(s) that enabled application software and users to exploit Cray hardware. Unicos provided a Unix based envrionment with many extensions needed for systems with multiple users and a complex workloads. Unicos provided added security, resource control, programming languages, data management features as well as processing accounting. Unicos versions (from Wikipedia) Cray
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Cray Software Applications
Cray Research focused on hardware but also made system and application software. Customers like to buy “a solution to a problem” and are rarely fussed by the actual technology used to deliver that solution. Alongside the need for developing language and systems software unique to the special Cray Hardware application software was developed. By having
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Les Davis (1930 — 2023)
It has recently been announced (December 2023) that Les Davis has passed away aged 93. An early and foundational influence on Cray Research Les worked closely with Seymour Cray and John Rollwagon to deliver the vision of supercomputing. Lester ‘T’ Les Davis was a senior engineer at Cray Research. As an early employee he worked
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EL and C90 Poster Centerfolds
These two posters appeared side by side in Cray Channels V13_N4 as centre folds. Also distributed as wall posters. These two machines, at the opposite ends of the Cray performance spectrum, nevertheless less ran the same UNICOS operating systems and compiler environments. The EL often appeared at larger Cray sites acting as a software development
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Contact Us – To contribute updates, corrections and stories
We would be very grateful If you have missing information or contributions / suggestions / stories or pictures for the site. Contact US Please Post an update on this page or email to webmaster@cray-history.net – Add XMP to Email subject line to avoid the spam traps. Acknowledgments This site contains the work and effort compiled from
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