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jrmunro
Joined: 01 Feb 2003
Posts: 3149
Location: Vancouver, Canada
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 Posted: Wed Nov 16, 2005 11:07 pm Post subject: Chip ID |
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I couldn`t find much info on these.
John |
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gshv
Joined: 01 Feb 2003
Posts: 7898
Location: Fairfax, VA USA
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| Posted: Wed Nov 16, 2005 11:49 pm Post subject: |
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I have a couple of SGI CLCC chips, and I didn't find much info on them too. I know these CGI chips are part of SGI geometry engine hardware, and that geometry engine was used to speed up 3-D calculations. That's about it...
Gennadiy |
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fRaSsL
Joined: 31 Mar 2003
Posts: 1570
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| Posted: Thu Nov 17, 2005 1:07 am Post subject: |
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The geometry engine used Intel i860XP CPU (8 pieces). There are no Weitek chips on it.
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jrmunro
Joined: 01 Feb 2003
Posts: 3149
Location: Vancouver, Canada
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| Posted: Thu Nov 17, 2005 1:26 am Post subject: |
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There were 8 geometry eng chips and 2 geometry accelerater chips on the board. From the same board I got 4 AM2903ADC and 1 AM2910APC chips.
The case had about 16 boards in it.
From one board I got an MC68000L10
From one board I got an MC68020RC16B
From one board I got an Intel R80186
From one board I got the 2 Weitek chips.
The other boards didn`t have anything of real interest.
The case didn`t have any Identifing marks on it.
It was in the scrapyard.
John |
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gshv
Joined: 01 Feb 2003
Posts: 7898
Location: Fairfax, VA USA
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| Posted: Thu Nov 17, 2005 8:55 am Post subject: |
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| fRaSsL wrote: | | The geometry engine used Intel i860XP CPU (8 pieces). There are no Weitek chips on it. |
There were versions with 6, 8 and 12 i860 processors. There were also versions with SGI custom chips - I was talking about those.
Gennadiy |
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morkork
Joined: 25 Feb 2003
Posts: 447
Location: Nuremberg, Germany
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| Posted: Thu Nov 17, 2005 5:28 pm Post subject: |
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| fRaSsL wrote: | | The geometry engine used Intel i860XP CPU (8 pieces). There are no Weitek chips on it. |
You're probably referring to this one, an SGI RealityEngine geometry engine: http://www.schrotthal.de/sgi/4d/sgi_ge8_800.html
An SGI geometry subsystem consists of data RAM, bus controllers and the Geometry Engine(s). It takes geometric data, performs the specified transformations and lighting computations, and then does calculations to reduce the subsequent vertex data into spans, lines, or points which are then passed to the raster subsystem. Thus, many kinds of fast floating point number crunchers were used for these calculations.
Here's a Weitek based GE from the 'Glover 2' graphics subsystem used in SGI Professional Iris Series, PowerSeries machines as well as the Crimson: http://www.g-lenerz.de/storage/images/sgistuff/powerseries/gtx_ge4.jpg. A very cut-down version of this board (with a single Weitek 3132) is in my Personal Iris 4D: http://www.cpu-collection.de/images/IrisGraphics.jpg.
Newer SGI graphics boards had custom made single chip GEs containing 2 or more hi-speed floating point units.
The basic GE principles are still valid for modern graphics cards. Modern GPUs like the GeForce 7800 GTX reach more than 200 GFLOPS, that's a VERY fast FPU compared to a Pentium 4 at 3GHz, which peaks out at 12 GFLOPS.
For comparison: A 40 MHz Intel i860 from 1989 reached about 80 MFLOPS (that's 0.08 GFLOPS), a 150 MHz Pentium (1996) 85 MFLOPS - so for its time the i860 was a very good performer.
(More information on SGI graphics here: http://sgistuff.g-lenerz.de/graphics/index.html)
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