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IRIX for Indigo2
From Higher Intellect Vintage Wiki
The SGI Indigo2 was initially delivered with IRIX 4D1-4.x. Support for the Indigo2 finally ended with IRIX 6.5.22.
Support for the Indigo2 IMPACT was available with point releases of IRIX 5.3 and IRIX 6.2. Patches to IRIX 6.2 were also shipped with the addition of the R10000 CPU option.