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The IRIS was a series of 68000-based computers using custom LSI for the graphics pipeline called Geometry Engines. There were three series of machines. The 1000 series was a terminal, the 2000 based on the 68000 processor, and 3000 series based on the 68020. The windowing system on the IRIS was called MEX (Multiple Exposure).

IRIS info at bitsavers.org

SGI IRIX 6.x branch
Preceded by
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SGI IRIS Followed by
SGI IRIX 3.x