[ColanderCombo]

The gfx architecture is described in the technical report, Chapter 3:

FWIW, the IrisVision boardset also implements the Eclipse architecture, and there's *very* detailed technical information including technical manuals for that here:

http://ps-2.kev009.com/ohlandl/video/Iris.html

There's complete register level documentation for every chip, which is pretty remarkable.

The XMAP2s are 5 way interleaved, each processing every 5th pixel on a scanline. The vertical lines look to be about every 5th pixel, which suggests to me an XMAP2 has gone bad

BUT.... The SGI logo image looks just fine. The XMAPs can switch between direct and color mapped mode on a per-window basis (using some combination of bits in the framebuffer), so I wonder if the color mapping memory attached to one of the XMAPs is to blame?

Display Subsystem: http://ps-2.kev009.com/ohlandl/video/iri...ence_7.pdf

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BUT.... The SGI logo image looks just fine. The XMAPs can switch between direct and color mapped mode on a per-window basis (using some combination of bits in the framebuffer), so I wonder if the color mapping memory attached to one of the XMAPs is to blame?

Also, the color map should be the static ram between the XMAPs and DACs. I don't know precisely how they're split up, but the CY7C169's are 4Kx4 components. Color map is 4Kx24, so there are 6 chips per XMAP for a total of 30. See page 147: http://www.bitsavers.org/components/cypr...a_Book.pdf