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The Video7 driver has only been tested on a Headland Technologies HT216-32
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chip, but should work on other Video 7/Headland Technologies chips as
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Currently this implementation of the video7 driver only supports single bank
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mode, which can cause performance degradation, and makes no attempt to
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distinguish between the different video7 chips.<p>
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It also does not probe for memory, so in your <tt>XF86Config</tt> file,
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make sure that you use the following line:<p>
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Where XXX is the amount of RAM in your card. Most of them have at least
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512k, so this is a good value to start with.<p>
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Also, the clock probing function of XFree86 doesn't seem to correctly
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get the clocks. The documentation I used (vgadoc3) suggests using the
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following values for the <tt>Clocks line</tt> in your
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<tt>XF86Config</tt> file:
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Clocks 25.175 28.322 30.000 32.514 34.000 36.000 38.000 40.000
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For 800x600 mode, use a dot clock of 38 instead of 36 or 40 as suggested in
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most of the sample <tt>XF86Config</tt> files and <tt>modeDB.txt.</tt>
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This seems to be what is
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used in the BIOS mode (0x69) which is the 800x600 in 256 colors.
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<sect>Known bugs and What's been tested:<p>
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<item>No video ram probing. Only known way to get this info is through
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an INT 10 call, but you can't do this in a user process.<p>
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<item>Clock probing. I'm not sure the docs in vgadoc3 are correct.<p>
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<item>Random lockups with the SVGA server<p>
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<sect1>What's been tested:<p>
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<item>An HT216-32 chip.<p>
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<item>800x600 mode and 640x480 mode<p>
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<item>Mode switching and switching to text mode through <tt>CTRL-ALT-F1</tt><p>
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<item>Only been tested on Linux.<p>
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<sect>Who to contact:<p>
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<bf>Craig Struble</bf> (<em/cstruble@acm.vt.edu/) Video 7 driver<p>
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<sect>Acknowledgments<p>
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<item><bf/Cara Cocking/ for loving me and supporting me. Without her I'd
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be a bowl of jello.<p>
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<item><bf/XFree86 team/ for the great stub code that allowed me to get this
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<item><bf/Finn Thoegersen/ for compiling vgadoc3. Without this I would not
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<item><bf/Harm Hanemaayer/ for the vga.c program in svgalib. Without this I
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would not have had the breakthroughs I needed to get the thing
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<sect1>Other things I've already done:<p>
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For Linux, I have a small patch to get the extended text modes to
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work on the Video 7 card.<p>
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<sect1>Things to do:<p>
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<item> Try dual banking mode.<p>
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<item> Write an svgalib driver.<p>
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<item> Go back to graduate school. (I'm a glutton for punishment.)<p>
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CRAIG STRUBLE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
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NO EVENT SHALL CRAIG STRUBLE BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE
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USE OR PERFORMANCE OF THIS SOFTWARE.<p>
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$XFree86: xc/programs/Xserver/hw/xfree86/doc/sgml/Video7.sgml,v 3.5 1997/01/24 09:32:34 dawes Exp $
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$XConsortium: Video7.sgml /main/3 1996/02/21 17:46:22 kaleb $