IRIX 6.5.22 Emulation: An interesting guide that will help you setup an emulated SGI (Silicon Graphics Indy) with a 100MHz MIPS R4600, 128MB of RAM, and 24-bit XL graphics, through MAME.

Refer to: https://sgi.neocities.org/ 
Also: http://forums.irixnet.org/thread-1012-page-18.html