Editing Silicon Graphics (section)

====IRIS 1000 series====
The first entries in the 1000 series (models 1000 and 1200, introduced in 1984) were graphics terminals, peripherals to be connected to a general-purpose computer such as a [[Digital Equipment Corporation]] [[VAX]], to provide graphical [[raster graphics|raster display]] abilities. They used 8&nbsp;MHz Motorola 68000 CPUs with {{nowrap|768 kB}} of RAM and had no [[disk drive]]s. They booted over the network<ref name=iris_terminal_guide_v1.3/> (via an [[Excelan]] EXOS/101 Ethernet card) from their controlling computer. They used the "PM1" CPU board, which was a variant of the board that was used in [[Stanford University]]'s [[SUN workstation]] and later in the [[Sun-1]] workstation from [[Sun Microsystems]]. The graphics system was composed of the GF1 [[frame buffer]], the UC3 "Update Controller", DC3 "Display Controller", and the BP2 bitplane. The 1000-series machines were designed around the [[Multibus]] standard.

Later 1000-series machines, the 1400 and 1500, ran at 10&nbsp;MHz and had 1.5 MB of RAM. The 1400 had a 72 MB [[ST-506]] disk drive, while the 1500 had a 474 MB SMD-based disk drive with a [[Xylogics]] 450 disk controller. They may have used the PM2 CPU and PM2M1 RAM board from the 2000 series.<ref name=irix_info_page/> The usual monitor for the 1000 series ran at 30&nbsp;Hz [[interlaced]]. Six beta-test units of the 1400 workstation were produced, and the first production unit (SGI's first commercial computer) was shipped to Carnegie-Mellon University's Electronic Imaging Laboratory in 1984.