USB

USB is officially supported on IRIX in a very limited fashion on Chimera (Tezro, Fuel, Origin/Onyx 3000, Origin/Onyx 3x0, and the Onyx4)

Classes Supported

invent.h defines four classes:

the root hub/controller

USB hubs

human interface devices

the graphics compositor (A peripheral used to composite multiple VPros into a single output)

The number of confirmed devices that work under IRIX is quite small, but users have reported the following can work:

Three-button/scroll wheel mice (It's unknown if mice with additional buttons work).

USB hubs

USB Audio (little documentation has survived Nekochan on this, but it is mentioned in dmedia documentation)

PCI USB cards (mostly USB 1.1 with a handful of 2.0 cards)

Adaptec AUA 3020 Rev B (Rev A doesn't work)

Belkin F5U220

Belkin N10117

SGI USB PCI card, SGI part number 9210286

Mass storage was never an option on IRIX and the lack of interoperable filesystems complicates efforts to use this.