PXG/PXG+/PXG Turbo/PXG Turbo+ boards for DECstation 5000 - test-drb@ccmp.vtda.org

12 Aug 2012

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  Date: Sun, 12 Aug 2012 09:39:31 -0600
 From: Richard <legalize at xmission.com>
 To: cctalk <cctalk at classiccmp.org>
 Subject: Re: PXG/PXG+/PXG Turbo/PXG Turbo+ boards for DECstation 5000
 Message-ID: <E1T0aGJ-0000zS-R7 at shell.xmission.com>

 In article <20120812105727.2a3ad798.jkunz at unixag-kl.fh-kl.de>,
     Jochen Kunz <jkunz at unixag-kl.fh-kl.de> writes:

  On Sat, 11 Aug 2012 14:53:46 -0600
 Richard <legalize at xmission.com> wrote:

  Does anyone have one of these boards?  Yes,
at least one PXG+ and IIRC a PXG that's the RAM modules missing. 
 I'd like to see some high resolution close-up pictures if possible!
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I have one of the PXG models in a Decstation 5000/200 up at the cottage, I
can try to get a picture
of the next time I'm at the cottage.  The PXG uses an i860 for 3D geometry
and a pixel planes chip
for 2D raster fill.  

A pixel planes chip is relatively easy to design, even with primitive VLSI
tools.  I built one in the
mid 1980s using a gate array technology that we had free access to.  Once
you have the cell
for a single pixel it's just a matter of duplication and adding some
interface logic around the
edge of the chip.