<story><title>Reverse-engineering the Yamaha DX7 synthesizer&apos;s sound chip from die photos (2021)</title><url>http://www.righto.com/2021/11/reverse-engineering-yamaha-dx7.html</url></story><parent_chain></parent_chain><comment><author>ajxs</author><text>I wrote the article mentioned by Ken: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;ajxs.me&amp;#x2F;blog&amp;#x2F;Yamaha_DX7_Technical_Analysis.html&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;ajxs.me&amp;#x2F;blog&amp;#x2F;Yamaha_DX7_Technical_Analysis.html&lt;/a&gt;&lt;p&gt;I&amp;#x27;ve unwittingly become a bit of a Yamaha FM Synth historian!&lt;p&gt;Here are some other contributions to reverse-engineering the DX7:&lt;p&gt;A fully documented disassembly of the DX7 ROM: &lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;github.com&amp;#x2F;ajxs&amp;#x2F;yamaha_dx7_rom_disassembly&quot;&gt;https:&amp;#x2F;&amp;#x2F;github.com&amp;#x2F;ajxs&amp;#x2F;yamaha_dx7_rom_disassembly&lt;/a&gt;&lt;p&gt;A new firmware ROM that makes the DX9 function more like a DX7:
&lt;a href=&quot;https:&amp;#x2F;&amp;#x2F;github.com&amp;#x2F;ajxs&amp;#x2F;yamaha_dx97&quot;&gt;https:&amp;#x2F;&amp;#x2F;github.com&amp;#x2F;ajxs&amp;#x2F;yamaha_dx97&lt;/a&gt;</text></comment>
<story><title>Reverse-engineering the Yamaha DX7 synthesizer&apos;s sound chip from die photos (2021)</title><url>http://www.righto.com/2021/11/reverse-engineering-yamaha-dx7.html</url></story><parent_chain></parent_chain><comment><author>dvas</author><text>This is great! What a lovely read.&lt;p&gt;Reminds me back of my teenage years mesmerised by software&amp;#x2F;hardware synths, daws and everything and anything related to audio tech. Hours spent trying to understand different waves, oscillations, LFOs, modulation, AM, FM and so on and so forth. I could go on all day. Great memories.&lt;p&gt;Anyhow, would be interesting to go down a rabbit hole reading up on the waveform representation for the DX7. Now that I remember, I will go ahead and look for SH-101.</text></comment>