Cray-3

The Cray-3 was a vector supercomputer intended to be Cray Research's successor to the Cray-2. The system was to be the first major application of gallium arsenide (GaAs) semiconductors in computing. The project was not considered a success, and the parent company in Minneapolis decided to end work on the Cray-3 in favour of their own design, the Cray C90. The Cray-3 project was spun off to the newly formed Cray Computer Corporation, but only one Cray-3 was delivered, and never paid for. Seymour Cray moved onto the Cray-4 design, but the company went bankrupt before the project was completed.

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Cray-3 - Architecture - Software
... The Cray-3 ran the Unicos operating system which included the X Window System plus FORTRAN and C compilers ...