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<div id="header">
<h1>Nucleus Demo</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>Unfortunately, the Nucleus demo and Photonix tool do not use the Soundsmith
format for their music. Instead they use a proprietary format. I decided to
reverse engineer this format as well and make a player for them as well.</p></div>
<div class="paragraph"><p>We, of course, start with loading the boot block:</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="color: #990000">.</span>/disasm nucleus<span style="color: #990000">.</span>2mg <span style="color: #993399">800</span> <span style="color: #993399">0</span> <span style="color: #993399">1</span> <span style="color: #990000">&gt;</span> boot<span style="color: #990000">.</span>s</tt></pre></div></div>
<div class="paragraph"><p>Which lets us discover the loader is in blocks 7&#8212;b.</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="color: #990000">.</span>/disasm nucleus<span style="color: #990000">.</span>2mg <span style="color: #993399">9600</span> <span style="color: #993399">7</span> <span style="color: #993399">4</span> <span style="color: #990000">&gt;</span> loader<span style="color: #990000">.</span>s</tt></pre></div></div>
<div class="paragraph"><p>The loader uses a table starting at <code>$9607</code>, where the first word is the
starting block, the second word is the number of blocks, followed by a dword
loading address. It repeats until the starting block has the high bit
set. Nucleus does not use any compression for its data.</p></div>
<div class="paragraph"><p>Using this, we discover the music player, which will let us discover where all
the music data and wavebanks are located. (It will also be the thing I study
the most in order to write a player).</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="color: #990000">.</span>/disasm nucleus<span style="color: #990000">.</span>2mg <span style="color: #993399">81000</span> <span style="color: #993399">333</span> <span style="color: #993399">4</span> <span style="color: #990000">&gt;</span> player<span style="color: #990000">.</span>s</tt></pre></div></div>
<div class="paragraph"><p>The sound player is more akin to MIDI than a tracker. The songs are broken into
channels, each channel controlling 4 oscillators. There aren&#8217;t any patterns,
there&#8217;s just a long list of note frequencies and note lengths for each channel.
This means each channel has its own play head, only advancing to the next note
when the note length elapses. Each channel loops independently as well.</p></div>
<div class="paragraph"><p>The first time the player initializes, it loads a wavebank from <code>$4/0000</code> into
sound RAM. Then all future initializations load a wavebank from <code>$3/0000</code>.
This means we have two wavebanks, one for the intro song, and the other for all
the main songs in the demo. I use the table from the loader to determine which
blocks are loaded for each memory location.</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="color: #990000">.</span>/decrunch nucleus<span style="color: #990000">.</span>2mg <span style="color: #993399">140</span> <span style="color: #993399">128</span> intro<span style="color: #990000">.</span>wb raw
<span style="color: #990000">.</span>/decrunch nucleus<span style="color: #990000">.</span>2mg <span style="color: #993399">12</span> <span style="color: #993399">128</span> main<span style="color: #990000">.</span>wb raw</tt></pre></div></div>
<div class="paragraph"><p>The player uses a block of data located at <code>$8/0300</code> to determine all sorts of
information about the songs and their channels. I&#8217;ll be calling it <code>songdefs</code>.</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="color: #990000">.</span>/decrunch nucleus<span style="color: #990000">.</span>2mg <span style="color: #993399">268</span> <span style="color: #993399">2</span> songdefs raw</tt></pre></div></div>
<div class="paragraph"><p>This file is divided into chunks. Each chunk is 256 bytes long, and contains
information about a song. So the first chunk contains information about the
intro song. The second chunk contains information about the first main song,
and so on. Using this we can determine there is 1 intro song, and 3 main songs.</p></div>
<div class="paragraph"><p>Each chunk contains instrument data for each channel, as well as where in memory
to find the note data for that song, as well has the playback speed.</p></div>
<div class="paragraph"><p>The word at offset <code>$44</code> in the chunk determines where the note
data for that specific song is located, inside bank 8. Using this we can
extract the note data for all the songs.</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt><span style="color: #990000">.</span>/decrunch nucleus<span style="color: #990000">.</span>2mg <span style="color: #993399">284</span> <span style="color: #993399">8</span> intro<span style="color: #990000">.</span>song raw
<span style="color: #990000">.</span>/decrunch nucleus<span style="color: #990000">.</span>2mg <span style="color: #993399">270</span> <span style="color: #993399">14</span> main1<span style="color: #990000">.</span>song raw
<span style="color: #990000">.</span>/decrunch nucleus<span style="color: #990000">.</span>2mg <span style="color: #993399">292</span> <span style="color: #993399">7</span> main2<span style="color: #990000">.</span>song raw
<span style="color: #990000">.</span>/decrunch nucleus<span style="color: #990000">.</span>2mg <span style="color: #993399">299</span> <span style="color: #993399">2</span> main3<span style="color: #990000">.</span>song raw</tt></pre></div></div>
<div class="paragraph"><p>I&#8217;ll also divide up the songdefs file to provide easy access to each song&#8217;s
instrument data.</p></div>
<div class="listingblock">
<div class="content"><!-- Generator: GNU source-highlight 3.1.8
by Lorenzo Bettini
http://www.lorenzobettini.it
http://www.gnu.org/software/src-highlite -->
<pre><tt>dd <span style="font-weight: bold"><span style="color: #0000FF">if</span></span><span style="color: #990000">=</span>songdefs <span style="color: #009900">bs</span><span style="color: #990000">=</span><span style="color: #993399">256</span> <span style="color: #009900">skip</span><span style="color: #990000">=</span><span style="color: #993399">0</span> <span style="color: #009900">count</span><span style="color: #990000">=</span><span style="color: #993399">1</span> <span style="color: #009900">of</span><span style="color: #990000">=</span>intro<span style="color: #990000">.</span>inst
dd <span style="font-weight: bold"><span style="color: #0000FF">if</span></span><span style="color: #990000">=</span>songdefs <span style="color: #009900">bs</span><span style="color: #990000">=</span><span style="color: #993399">256</span> <span style="color: #009900">skip</span><span style="color: #990000">=</span><span style="color: #993399">1</span> <span style="color: #009900">count</span><span style="color: #990000">=</span><span style="color: #993399">1</span> <span style="color: #009900">of</span><span style="color: #990000">=</span>main1<span style="color: #990000">.</span>inst
dd <span style="font-weight: bold"><span style="color: #0000FF">if</span></span><span style="color: #990000">=</span>songdefs <span style="color: #009900">bs</span><span style="color: #990000">=</span><span style="color: #993399">256</span> <span style="color: #009900">skip</span><span style="color: #990000">=</span><span style="color: #993399">2</span> <span style="color: #009900">count</span><span style="color: #990000">=</span><span style="color: #993399">1</span> <span style="color: #009900">of</span><span style="color: #990000">=</span>main2<span style="color: #990000">.</span>inst
dd <span style="font-weight: bold"><span style="color: #0000FF">if</span></span><span style="color: #990000">=</span>songdefs <span style="color: #009900">bs</span><span style="color: #990000">=</span><span style="color: #993399">256</span> <span style="color: #009900">skip</span><span style="color: #990000">=</span><span style="color: #993399">3</span> <span style="color: #009900">count</span><span style="color: #990000">=</span><span style="color: #993399">1</span> <span style="color: #009900">of</span><span style="color: #990000">=</span>main3<span style="color: #990000">.</span>inst</tt></pre></div></div>
<div class="paragraph"><p>And that&#8217;s all there is to it.</p></div>
<div class="paragraph"><p>Photonix was extracted in a similar way.</p></div>
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Last updated
2017-08-21 10:48:15 MST
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