Question about Personal IRIS

[Yukio Yagi]

I am interested in the performance numbers of the Personal IRIS.
In the "Periodic Table of the IRIS's" dated April 2, 1990 the
following numbers are given:

        Personal IRIS 4D/25G has performance of 5.1K Polygons/sec.
        Personal IRIS 4D/25TG has performance of 24K Polygons/sec.

According to the comments, "polygon" numbers are for 10x10 (100pixel),
full 24-bit color, Lighted, Gouraud-shaded, Z-buffered polygons with
arbitrary orientation.

What I want to know is:

        1. What's the meaning of "Lighted"?  Is the lighting calculation at
           each vertex pre-computed or computed at display time?

        2. How many and what kind of light sources are used?  What
           reflection model is used?

Any information is helpful.  Please e-mail or post to this group.
Thanks in advance.
                                                Yukio Yagi
                                                Solbourne Computer Inc.
                                                yagi at solbourne.com or
                                                uunet!stan!yagi