SGI IRIS 4D
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The SGI IRIS 4D series was a line of workstations from Silicon Graphics built in the late-1980s through mid-1990s. They were the first SGI workstations to use the MIPS architecture. The line culminated with the Crimson which was produced until 1997.
SGI timeline
![](http://upload.wikimedia.org/wikipedia/en/timeline/efm0jkgiyhed49bzgmoa9dwnt6lw3rr.png)