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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Maybe the original design on the etched PCB was a general purpose MIDI board (hence the matching firmware) and provided an 8 bit GPIO port, but disobeyed the
rules and omitted the opto-isolator, so whoever used it added that as well as the DAC they needed for this design on the perfboard.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> Synth-diy [mailto:synth-diy-bounces@synth-diy.org]
<b>On Behalf Of </b>René Schmitz<br>
<b>Sent:</b> 28 September 2022 11:29<br>
<b>To:</b> synth-diy@synth-diy.org<br>
<b>Subject:</b> Re: [sdiy] Identification of an unknown MIDI CV interface<o:p></o:p></span></p>
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<p class="MsoNormal">Hi all,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On 28.09.2022 11:30, Ingo Debus via Synth-diy wrote:<o:p></o:p></p>
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<p class="MsoNormal"><a href="https://florian-anwander.de/moog_prodigy/Unknown_Midi_Interface.jpg"><span style="font-size:10.5pt;font-family:"Helvetica","sans-serif"">https://florian-anwander.de/moog_prodigy/Unknown_Midi_Interface.jpg</span></a><o:p></o:p></p>
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<p class="MsoNormal">The etched PCB looks like a general purpose board. The MIDI stuff and the DAC are on the perf board.<o:p></o:p></p>
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<p>That's what I was thinking too, but what is interesting is that the logo on the EPROM matches the one on the board.
<o:p></o:p></p>
<p>So Hardware and Firmware seem to be from the same origin.<o:p></o:p></p>
<p>But the rest seems very bespoke and has a high home brew appeal. This doesn't quite fit to me, because who
<o:p></o:p></p>
<p>ever wrote the firmware would know what hardware to drive.<o:p></o:p></p>
<p><o:p> </o:p></p>
<p><o:p> </o:p></p>
<p>Best,<o:p></o:p></p>
<p> René<o:p></o:p></p>
<p><o:p> </o:p></p>
<pre>--<o:p></o:p></pre>
<pre><a href="mailto:synth@schmitzbits.de">synth@schmitzbits.de</a><o:p></o:p></pre>
<pre><a href="http://schmitzbits.de">http://schmitzbits.de</a><o:p></o:p></pre>
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