Quick check on those: was it beige? The IRIS x000 series were the only beige computers SGI produced. If it was brown it's a 4D. They made them in 3 sizes, I've seen 2 (terminal and deskside) The terminal could sit on your desk. 9 Multibus slots, no disks The deskside is the most common- 20 Multibus slots, 2 5.25" FH HDD positions and 1 5.25" FH removable-media position, along with much dead space. Stands about 3' high. There are rumors of a rackmount designed to use SMD drives, for those who needed big, fast storage. There are a number of people on the list with these, if you're interested grab it.