View source for 68k-based SGIs (IRIS Series)

[[File:SGI IRIS 2400.png|thumb|An IRIS 2000 owned by System Source]]
The earliest SGI systems were 68000-68020 powered graphics terminals and workstations running [[GL2]], a System V UNIX with an unusual for the time focus on graphics. Multibus standard powered machines, they were similar to Sun Multibus systems in many respects.

They were replaced by the [[Professional IRIS]] series of systems.

== IRIS 1000 Series ==
[[File:IRIS 1000 Terminal.jpg|left|thumb|An IRIS 2000 Terminal]]
The 1000 and 1200 computers used a Motorola 68000 microprocessor clocked at 8 Mhz and were sold as diskless systems intended for use as a terminal to a VAX system. The mainboard in the IRIS 1x00 machines is of Sun origin, existing before the founding of Sun Microsystems.

=== IRIS 1400 and 1500 ===
The 1400 and 1500 were equipped with a 10 MHz Motorola 68010 microprocessor, 1.5 MB of RAM and supported ST-506 or SMD drives. IRIS 1400 and 1500 used [[GL2-1.x|GL2 operating system]], Version 1. It uses the earliest version of IRIS Graphics. Additional memory, a floating point unit and a faster CPU were available. 

== IRIS 2000 Series ==
The IRIS 2000 series includes the 2000 and 2200 terminals and the 2300, 2400 and 2500 workstations. These use the PM2 multibus board with a Motorola 68010 clocked at 10MHz. The SKYFPM-M-03 is an optional FPU board for these systems.  These systems supported a max of 2MB of RAM. [[GL2-2.x]] is the singular OS used by these.  

=== IRIS 2000 Turbo ===
The 2300, 2400 and 2500 were later updated with a Turbo board, which used the IP2 68020 CPU at 14MHz and the FP1 floating point accelerator. They supported a max of 16MB RAM. 

== IRIS Graphics ==
The IRIS Graphics system uses VLSI Geometry Engines and lacks any support for texturing. Within each GE is:

* 4 Matrix Engines
* 4-6 Clipper Engines
* 2 Scaler Engines
As the product line grew, the basis remained the same, but with more CPUs, more RAM, and more bitplanes and performance as a result. 

== IRIS 3000 Series ==
[[File:IRIS 3130 Rebrand.jpg|thumb|A rebranded 3130 workstation from the front. Courtesy of sgistuff.net]]
The IRIS 3000 series was the end of the Motorola 68000 line for SGI. All IRIS 3000s use the Motorola 68020 running at 16MHz. The 3010 is the singular terminal system, with the 3020, 3030, 3110, 3115, 3120, and 3130 all being workstations. All use the IP2 processor board which uses a private bus between the CPU, FPU and memory. The 3000 series uses a 10-GE Enhanced IRIS Graphics, which has 10GEs and 8 bitplanes with a max of 12MB for the terminal and 16MB for the workstations. 

[[GL2-3.x]] is the singular OS used by these. The later IRIS 3100 series uses a slightly enhanced IRIS Graphics boardset with 12 GEs, and a max of 32 bitplanes. 
[[File:IRIS 3130 Rebrand Rear.jpg|left|thumb|A rebranded 3130 workstation from the rear. Courtesy of sgistuff.net]]
[[Category:Hardware]]