SGI Indigo

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Silicon Graphics Indigo

Also known as	SGI IRIS Indigo
Developer	SGI
Type	3D Graphics workstation
Release date	1991
Discontinued	1995
Predecessor	SGI IRIS 4D
Successor	SGI Indigo2 SGI Crimson

The Indigo, introduced as the IRIS Indigo, is a line of workstation computers developed and manufactured by Silicon Graphics, Inc. (SGI). SGI first announced the system in July 1991.^[1]

The Indigo is one of the most capable graphics workstations of its era, and was essentially peerless in the realm of hardware-accelerated three-dimensional graphics rendering. For use as a graphics workstation, the Indigo was equipped with a two-dimensional framebuffer or, for use as a 3D graphics workstation, with the Elan graphics subsystem including one to four Geometry Engines (GEs). SGI sold a server version with no video adapter.

The Indigo's design is based on a simple cube motif in indigo hue. Graphics and other peripheral expansions are accomplished via the GIO32 expansion bus.

The Indigo was superseded generally by the SGI Indigo2, and in the low-cost market segment by the SGI Indy.