Operating System
The Indigo was designed to run SGI's version of UNIX, known as IRIX. The Indigos with R3000 processors were supported in IRIX through version 5.3 of that operating system, while Indigos equipped with an R4000 or R4400 processor can run IRIX 6.5 up to 6.5.22.
Additionally, the free Unix-like operating system NetBSD has support for both the IP12 and IP20 Indigos as part of the sgimips port.
Read more about this topic: SGI Indigo
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