Format fix some of 2006 entries' index.html
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@@ -409,7 +409,7 @@ Location: <a href="../../location.html#US">US</a> - <em>United States of America
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<!-- BEFORE: 1st line of markdown file: 2006/grothe/README.md -->
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<h2 id="to-build">To build:</h2>
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<pre><code> make</code></pre>
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<p>NOTE: this entry requires the <code>X11/Xlib.h</code> header file and the X11 library to
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<p><strong>NOTE</strong>: this entry requires the <code>X11/Xlib.h</code> header file and the X11 library to
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compile. For more information see the
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FAQ on “<a href="../../faq.html#X11">X11</a>”.</p>
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<h2 id="to-use">To use:</h2>
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@@ -430,9 +430,20 @@ the frequencies for an old fashion touch tone phone, so old songs can be played
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by hitting <code>0-9</code>,<code>#</code>, and <code>*</code>.</p>
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<p>To be able to run the program you need to determine the following
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parameters:</p>
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<pre><code> carrier_freq - base frequency used to host music
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pixelclock - refresh rate of the monitor
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horizontal_total - total scan along the horizontal axis</code></pre>
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<ul>
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<li><code>carrier_freq</code>
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<ul>
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<li>base frequency used to host music</li>
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</ul></li>
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<li><code>pixelclock</code>
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<ul>
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<li>refresh rate of the monitor</li>
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</ul></li>
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<li><code>horizontal_total</code>
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<ul>
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<li>total scan along the horizontal axis</li>
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</ul></li>
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</ul>
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<p>If you have <code>xvidtune</code> installed you can get the <code>pixelclock</code> and
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<code>horizontal_total</code> with the following command</p>
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<pre><code> xvidtune -show | head -n 1 | awk '{ print "pixelclock " $2 * 1000000 " horizontal_total = " $6 }'</code></pre>
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@@ -454,29 +465,33 @@ and <a href="https://en.wikipedia.org/wiki/ZX81">Timex Sinclair ZX-81</a>s.</p>
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<p>Others can be found by doing a search for “touch tone phone songs”.</p>
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<h3 id="obfuscations">Obfuscations</h3>
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<ul>
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<li><p>Some numbers expressed in Octal, some in hex and some in decimal:
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“A foolish consistency is the hobgoblin of little minds” - Ralph Waldo
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Emerson.</p></li>
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<li><p>Funky scoping, looking at the nanosleep section and <code>XsetWindowAttributes</code>
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declares local variables.</p></li>
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<li><p>Algorithm is very weird, uses <code>y</code> dimension to draw carrier frequency
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<li>Some numbers expressed in Octal, some in hex and some in decimal:</li>
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</ul>
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<blockquote>
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<p>“A foolish consistency is the hobgoblin of little minds.” - Ralph Waldo
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Emerson.</p>
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</blockquote>
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<ul>
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<li>Funky scoping, looking at the nanosleep section and <code>XsetWindowAttributes</code>
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declares local variables.</li>
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<li>Algorithm is very weird, uses <code>y</code> dimension to draw carrier frequency
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and <code>x</code> dimension to draw audio frequency, based on <a href="http://www.erikyyy.de">Erik
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Thiele</a>’s
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<a href="http://www.erikyyy.de/tempest/">Tempest for Eliza</a>.</p></li>
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<li><p>lack of <code>#define</code>s confuses many people :-)</p></li>
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<li><p>figuring out your <code>pixelclock</code> and <code>horizontal_total</code> and which <code>carrier_freq</code>
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to use can be an exercise in obfuscation for the user.</p></li>
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<li><p>use of commas in various places, confuses most C code beautifiers
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sometimes making the beautified code harder to read</p></li>
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<li><p>use of <code>static</code> to ensure initialization is EVIL and done in several
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places</p></li>
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<li><p>uses <code>static</code> declarations & <code>void</code> function returns we don’t care about
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making the code harder to read.</p></li>
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<li><p>does sound using only <a href="https://en.wikipedia.org/wiki/Xlib">X11 libs</a>, no other
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libs required.</p></li>
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<li><p>demonstrates tempest emissions in a fun/easy way.</p></li>
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<li><p>follows good programming practices of actually setting exit codes and giving
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usage when run with incorrect parameters.</p></li>
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<a href="http://www.erikyyy.de/tempest/">Tempest for Eliza</a>.</li>
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<li>lack of <code>#define</code>s confuses many people :-)</li>
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<li>figuring out your <code>pixelclock</code> and <code>horizontal_total</code> and which <code>carrier_freq</code>
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to use can be an exercise in obfuscation for the user.</li>
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<li>use of commas in various places, confuses most C code beautifiers
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sometimes making the beautified code harder to read</li>
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<li>use of <code>static</code> to ensure initialization is EVIL and done in several
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places</li>
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<li>uses <code>static</code> declarations & <code>void</code> function returns we don’t care about
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making the code harder to read.</li>
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<li>does sound using only <a href="https://en.wikipedia.org/wiki/Xlib">X11 libs</a>, no other
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libs required.</li>
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<li>demonstrates tempest emissions in a fun/easy way.</li>
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<li>follows good programming practices of actually setting exit codes and giving
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usage when run with incorrect parameters.</li>
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</ul>
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<h3 id="references">References</h3>
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<p><a href="http://www.erikyyy.de/tempest/">Tempest for Eliza - Basis for Algorithms</a>.</p>
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