<html><head></head><body><div style="font-family:verdana, helvetica, sans-serif;font-size:13px;"><div><div>The <span><span style="font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;">SN76477 brings back many memories, thank you for the reminder as I need to get my hands on a few... :)</span></span></div><div><br></div><div class="ydp81132ef6signature"><div><font size="2">Sincerely, <br> </font></div><div><font size="2">Chris Juried <br>Audio Engineering Society (AES) <var id="ydp81132ef6yui-ie-cursor"></var>Member <br>InfoComm-Recognized AV Technologist</font><span class="ydp81132ef6postbody"><br><a href="http://www.JuriedEngineering.com" rel="nofollow" target="_blank">http://www.JuriedEngineering.com</a> <br><a href="http://www.TubeEquipment.com" rel="nofollow" target="_blank">http://www.TubeEquipment.com</a> <br><a href="http://www.HistoryOfRecording.com" rel="nofollow" target="_blank">http://www.HistoryOfRecording.com</a> <br></span><a href="http://www.linkedin.com/in/chrisjuried" rel="nofollow" target="_blank">http://www.linkedin.com/in/chrisjuried</a><br></div><div><font size="3"><font size="2"><b>Email:</b> <a href="mailto:CJuried@yahoo.com" rel="nofollow" target="_blank">CJuried@yahoo.com</a> <br><b>Voice:</b> (954) 478-4355 <br><br><br>This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any distribution or copying of this email, and any attachments thereto, is strictly prohibited. If you have received this email in error, please immediately notify me at (954) 300-9972 and permanently delete the original and any copy of any e-mail and any printout thereof.</font></font><br></div></div></div>
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On Wednesday, May 23, 2018, 1:11:46 PM EDT, John Speth <john.speth@andrews-cooper.com> wrote:
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<p class="ydp9986a3cyiv9997641590MsoNormal">I got the chip from RS in the 70’s. It was fun to play with but compared to what one can do today, it’s just a historical novelty today. I still have that chip plus the folding paper that was stapled to the back of the card.</p>
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<p class="ydp9986a3cyiv9997641590MsoNormal">JJS</p>
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<div class="ydp9986a3cyiv9997641590yqt4488422143" id="ydp9986a3cyiv9997641590yqt97378"><p class="ydp9986a3cyiv9997641590MsoNormal"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> <b>
On Behalf Of </b>cheater00 cheater00<br clear="none">
<b>Sent:</b> Tuesday, May 22, 2018 9:16 PM<br clear="none">
<b>To:</b> synth-diy mailing list <synth-diy@synth-diy.org><br clear="none">
<b>Subject:</b> [sdiy] TI 76477 Space Invaders sound chip detailed analysis</p>
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<p class="ydp9986a3cyiv9997641590MsoNormal">I've just found this while surfing the internet, an analysis of the 76477 sound chip's digital sound circuits. This includes the unique shift-register based noise circuit, as well as the noise filter circuit (which is analog):</p>
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<p class="ydp9986a3cyiv9997641590MsoNormal"><a shape="rect" href="http://www.righto.com/2018/05/inside-76477-space-invaders-sound.html" rel="nofollow" target="_blank">http://www.righto.com/2018/05/inside-76477-space-invaders-sound.html</a></p>
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<p class="ydp9986a3cyiv9997641590MsoNormal">Here's an earlier anysis of the analog circuitry:</p>
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<p class="ydp9986a3cyiv9997641590MsoNormal"><a shape="rect" href="http://www.righto.com/2017/04/reverse-engineering-76477-space.html" rel="nofollow" target="_blank">http://www.righto.com/2017/04/reverse-engineering-76477-space.html</a></p>
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<p class="ydp9986a3cyiv9997641590MsoNormal">I wonder if anyone has tried cloning the chip for synth use, with modern features like eg tuning.</p>
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