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

[[File:SGI IRIS 2400.webp|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 a Geometry Engine VLSI GPU and 8-bit graphics planes of 1024x1024 memory. 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. 

=== 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

[[Category:Hardware]]