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<div dir="ltr" data-setdir="false"><div><div dir="ltr">Thanks for the input. <br clear="none"></div><div dir="ltr">So
I traced the main problem being caused by the GND 2, the GND for the
-6.5 and +8.5, not getting to the KBC via the KAS board. <br clear="none"></div><div dir="ltr">So
now the Brilliance controllers work on all but one of the octaves. I
checked the logic on the 3 lines that select the octave and they are
working as expected. I checked the resistors around the octave ladder
and they are correct. So it seems I do have a partially functioning
YM26700. I can't see what else it could be. Just for piece of mind i
replaced the shift registers and flip flops. Still no joy.<br clear="none"></div><div dir="ltr">A
retrofit would be amazing for me and many others. It could save many of
the Yamaha CS series in the future. They are ticking time bombs for
these beautiful synths. I know Old Crow was working on something similar
a couple of years ago, not sure what happened with that project.</div><div dir="ltr">I do not have the design skills for this, but would happily help anybody brave enough to take it on!</div><div dir="ltr">best<br clear="none"></div>Al</div><div><br></div></div><div><br></div>
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On Friday, October 2, 2020, 4:25:41 AM PDT, Roman <modular@go2.pl> wrote:
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<div><div id="ydp82ffecacyiv4497804496"><div><div>Plus of course the glissando adder, so this rules out discrete logic design, and here comes small microcontroller.<br clear="none"></div><div><br clear="none"></div><div>Roman<br clear="none"></div><div class="ydp82ffecacyiv4497804496nh_extra"><div class="ydp82ffecacyiv4497804496yqt1661154368" id="ydp82ffecacyiv4497804496yqtfd88781"><p>Dnia 2 października 2020 12:32 Roman Sowa <modular@go2.pl> napisał(a):<br clear="none"></p><blockquote class="ydp82ffecacyiv4497804496nh_quote" style="border-left:2px solid #999;padding-left:8px;margin:0;"><div id="ydp82ffecacyiv4497804496gwp246b9ebb"><div>YM26700 is just a bunch of multiplexers. It selects octave voltages from<br clear="none"></div><div>one external resistor ladder and semitone voltages from another resistor<br clear="none"></div><div>ladder and drives 8 outputs sequentially with Hz/V voltages, all<br clear="none"></div><div>controlled by key assigner.<br clear="none"></div><div><br clear="none"></div><div>If it goes for $2000 (I saw them on ebay for $600) it's hard to believe<br clear="none"></div><div>noone has ever done a replacement yet.<br clear="none"></div><div><br clear="none"></div><div>So, who's going to be first offering YM26700 retrofit?<br clear="none"></div><div>Don't look at me, I don't have time for this.<br clear="none"></div><div><br clear="none"></div><div>Roman<br clear="none"></div><div><br clear="none"></div><div><br clear="none"></div><div>W dniu 2020-10-02 o 11:21, Gordonjcp pisze:<br clear="none"></div><blockquote><div>On Thu, Oct 01, 2020 at 07:48:47PM -0700, TERRY SHULTZ wrote:<br clear="none"></div><blockquote><div>Hi Al,<br clear="none"></div><div><br clear="none"></div><div>I spoke with Paul Morte and he indicated that the YM2600 is going for about $2000 USD these days.<br clear="none"></div></blockquote><div><br clear="none"></div><div>What does the YM26700 do, and how easily do you think it could be cloned or emulated?<br clear="none"></div><div><br clear="none"></div></blockquote><div>_______________________________________________<br clear="none"></div><div>Synth-diy mailing list<br clear="none"></div><div><a shape="rect" href="mailto:Synth-diy@synth-diy.org" rel="nofollow" target="_blank">Synth-diy@synth-diy.org</a><br clear="none"></div><div><a shape="rect" href="http://synth-diy.org/mailman/listinfo/synth-diy" rel="nofollow" target="_blank">http://synth-diy.org/mailman/listinfo/synth-diy</a><br clear="none"></div></div></blockquote></div></div><div class="ydp82ffecacyiv4497804496yqt1661154368" id="ydp82ffecacyiv4497804496yqtfd04052"><div><br clear="none"></div></div></div></div><div class="ydp82ffecacyqt1661154368" id="ydp82ffecacyqtfd42041">_______________________________________________<br clear="none">Synth-diy mailing list<br clear="none"><a shape="rect" href="mailto:Synth-diy@synth-diy.org" rel="nofollow" target="_blank">Synth-diy@synth-diy.org</a><br clear="none"><a shape="rect" href="http://synth-diy.org/mailman/listinfo/synth-diy" rel="nofollow" target="_blank">http://synth-diy.org/mailman/listinfo/synth-diy</a><br clear="none"></div></div>
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