> my mate mark was saying Model 2 has monochromic textures and the way it made
> colour was by stacking several together? Got any more info on this, it sounds
> really unusual!

I dont think so, but Elsemi's the one to answer that one...

> Also he said it was dervied from military flight simulator chipsets, hence why
> it's so hard to get docs on it!

Model 2's 3D was developed to order by Fujitsu to a pretty exact specification as laid down by Sega with assitance by General Electric/Martin Marietta when Sega required some beefing up of the existing Model 1 hardware (texture mapping, higher polygon count etc.)
It wasnt specifically military, just general flight simulators (the commercial ones are just as advanced) and as I've said before, the reason doc's are so hard to get for it is because it's a 1 off custom chip made for 1 purpose/customer only, it was never intended for public use, so the documents were never released to the public, and if you know anything about what happens in large companies, you know things go missing when they're not kept somewhere visable...

> But Model 3 was a real 3dfx-type chip yeah?

Model 3's 3D system was developed jointly by Lockheed Martin's Real3D division and Sega from the ground up (not a modified to fit system like Model 2) and it was a *lot* more advanced than anything else at the time (a lot more advanced than 3DFX)

Six...

System16 - The Arcade Museum