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sgi o2 wikipedia 178 captures 15 dec 2005 24 sep 2026 sep oct nov 03 2021 2022 2023 success fail about this capture timestamps the wayback machine http web archive org web 20221003104201 https en wikipedia org wiki sgi_o2 sgi o2 from wikipedia the free encyclopedia jump to navigation jump to search unix workstation from silicon graphics this article needs additional citations for verification please help improve this article by adding citations to reliable sources unsourced material may be challenged and removed find sources sgi o2 news newspapers books scholar jstor october 2019 learn how and when to remove this template message sgi o2 manufacturer silicon graphics inc release date october 1996 operating system irix cpu r5000 rm7000 r10000 or r12000 memory 32 mb up to 1 gb predecessor sgi indy sgi o2 workstation the o2 was an entry level unix workstation introduced in 1996 by silicon graphics inc sgi to replace their earlier indy series like the indy the o2 used a single mips microprocessor and was intended to be used mainly for multimedia its larger counterpart was the sgi octane the o2 was sgi s last attempt at a low end workstation contents 1 hardware 1 1 system architecture 1 2 cpu 1 3 memory 1 4 i o 1 5 disks 1 6 graphics 1 7 operating systems 2 performance 3 uses 4 sgi timeline 5 references 6 external links hardware edit system architecture edit originally known as the moosehead project the o2 architecture featured a proprietary high bandwidth unified memory architecture uma to connect system components a pci bus is bridged onto the uma with one slot available 1 it had a designer case and an internal modular construction two scsi drives could be mounted on special caddies 1 in the later r10000 r12000 models due to heat constraints and an optional video capture sound cassette mounted on the far left side cpu edit the o2 comes in two distinct cpu flavours the low end mips 180 to 350 mhz r5000 or rm7000 based units and the higher end 150 to 400 mhz r10000 or r12000 based units the 200 mhz r5000 cpus with 1 mb l2 cache are generally noticeably faster than the 180 mhz r5000s with 512 kb cache there is a hobbyist project that has successfully retrofitted a 600 mhz rm7xxx mips processor into the o2 memory edit there are eight dimm slots on the motherboard and memory and all o2s are expandable to 1 gb using proprietary 239 pin sdram dimms the memory rendering engine mre asic contains the memory controller memory is accessed via a 133 mhz 144 bit bus of which 128 bits are for data and the remaining for ecc this bus is interfaced by a set of buffers to the 66 mhz 256 bit memory system i o edit i o functionality is provided by the io engine asic the asic provides a 64 bit pci bus an isa bus two ps 2 ports for keyboard and mouse and a 10 100 base t ethernet port the pci bus has one 64 bit slot but the isa bus is present solely for attaching a super i o chip to provide serial and parallel ports disks edit rear view of an sgi o2 the o2 carries an ultrawide scsi drive subsystem adaptec 7880 older o2 s generally have 4x speed toshiba cd roms but any toshiba scsi cd rom can be used as well as from other manufacturers the bezel replacement however is designed to fit toshiba design and also irix cannot utilize cd da mode other than toshiba later units have toshiba dvd roms the r5000 rm7000 units have two available drive sleds for sca ultrawide scsi hard disks because the r10000 r12000 cpu module has a much higher cooling fan assembly the r10000 r12000 units have room for only one drive sled graphics edit sgi o2 internals the o2 used the crm chipset specifically developed by sgi for the o2 it was developed to be a low cost implementation of the opengl 1 1 architecture with arb image extensions in both software and hardware the chipset consists of the microprocessor and the ice mre and display asics all display list and vertex processing as well as the control of the mre asic is performed by the microprocessor the ice asic performs the packaging and unpacking of pixels as well as operations on pixel data the mre asic performs rasterization and texture mapping due to the unified memory architecture the texture and framebuffer memory comes from main memory resulting in a system that has a variable amount of each memory the display engine generates analog video signals from framebuffer data fetched from the memory for display operating systems edit several operating systems support the o2 irix 6 3 or 6 5 x native platform linux port is working but some drivers are missing both gentoo and debian have releases that work on the o2 see the ip32 port page on linux mips org openbsd has run on the o2 since openbsd 3 7 see the sgi port page netbsd has run on the o2 since netbsd 2 0 it was the first open source operating system to be ported to the o2 2 see the sgimips port page performance edit the sgi o2 has an imaging and compression engine ice application specific integrated circuit asic for processing streaming media and still images 3 ice operates at 66 mhz and contains a r3000 derived microprocessor serving as the scalar unit to which a 128 bit simd unit is attached using the mips coprocessor interface 3 ice operates on eight 16 bit or sixteen 8 bit integers 3 but still provides a significant amount of computational power which enables the o2 to do video decoding and audio tasks that would require a much faster cpu if done without simd instructions ice only works with the irix operating system as this is the only system that has drivers capable of taking advantage of this device the unified memory architecture means that the o2 uses main memory for graphics textures making texturing polygons and other graphics elements trivial instead of transferring textures over a bus to the graphics subsystem the o2 passes a pointer to the texture in main memory which is then accessed by the graphics hardware this makes using large textures easy and even makes using streaming video as a texture possible since the cpu performs many of geometry calculations using a faster cpu will increase the speed of a geometry limited application the o2 s graphics is known to have slower rasterization speed than the indigo2 s maximum impact graphics boards though the maximum impact graphics is limited to 4 mb of texture memory which can result in thrashing whereas the o2 is limited only by available memory while cpu frequencies of 180 to 400 mhz seem low today when the o2 was released in 1996 these speeds were on par with or above the current offerings for the x86 family of computers cf intel s pentium and amd s k5 uses edit o2s were often used in the following fields imaging especially medical on air tv graphics the most widespread example of an o2 running tv graphics is the weather star xl computer for the weather channel desktop workstation 3d modelling analogue video post production defense industries sgi timeline edit references edit sgi o2 r5000 majix hardware web site retrieved august 3 2013 includes photos netbsd ported to sgi o2 a b c kilgard mark j 1997 realizing opengl two implementations of one architecture 1997 siggraph eurographics workshop pp 45 55 external links edit wikimedia commons has media related to silicon graphics o2 sgistuff o2 remotely installing sgi irix 6 5 from a gnu linux server sgi o2 power supply basics v t e silicon graphics company silicon graphics 1981 2009 silicon graphics international 2009 2016 people kurt akeley rick belluzzo david j brown james h clark paul haeberli herb kuta abbey silverstone computer architectures motorola 68000 sgi iris former models mips iris 4d indigo indigo² and challenge m indy crimson o2 octane challenge onyx origin 200 origin 2000 onyx2 origin and onyx 3000 fuel tezro ia 32 itanium x86 64 visual workstation altix prism virtu graphics hardware geometry engine elan extreme impact vpro realityengine infinitereality irisvision reality coprocessor monitors 1600sw other technology irix image format mex workspace 4sight interactive desktop xsgi 4dwm xfs iris gl opengl openldi gio xio numalink nintendo 64 retrieved from https en wikipedia org w index php title sgi_o2 oldid 1061656959 categories sgi workstations 64 bit computers hidden categories pages using the easytimeline extension articles with short description short description matches wikidata articles needing additional references from october 2019 all articles needing additional references commons category link is on wikidata navigation menu personal tools not logged in talk contributions create account log in namespaces article talk english views read edit view history more search navigation main page contents current events random article about wikipedia contact us donate contribute help learn to edit community portal recent changes upload file tools what links here related changes upload file special pages permanent link page information cite this page wikidata item print export download as pdf printable version in other projects wikimedia commons languages español français 한국어 русский suomi svenska edit links this page was last edited on 23 december 2021 at 02 01 utc text is available under the creative commons attribution sharealike license 3 0 additional terms may apply by using this site you agree to the terms of use and privacy policy wikipedia is a registered trademark of the wikimedia foundation inc a non profit organization privacy policy about wikipedia disclaimers contact wikipedia mobile view developers statistics cookie statement