> 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)

Actually the Model 3 chipset was first developed as a standalone graphics processor for high-end use. Lockheed sold it as a big box with a SCSI-2 interface and a monitor connector for high-end visualization. That's why in Model 3 the CPU/sound (upper) board talks to the lower (3D) board via SCSI-2. A much less powerful derivative of that chipset became the Intel i740, for those who remember that :-)

And the textures are full color on both Model 2 and 3. The only thing "odd" about Model 2 relative to "modern" 3D is that it used quads (like Model 1 and Saturn) instead of triangles. Model 3 is a triangle machine however.