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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Ceramic with gold lid and gold brazed pins. I also have a Cerdip and a plastic part which were also engineering samples when they were released. My first design at Tektronix was the 8080 processor board for the 4025 graphics terminal. It was also the first 8080 design in the company as other designs were based on the 6800 or other processors. As such I had a good relationship with Intel and was given all the first parts for engineering evaluation.<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><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dave<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><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Synth-diy [mailto:synth-diy-bounces@synth-diy.org] <b>On Behalf Of </b>Dave Leith<br><b>Sent:</b> Friday, October 06, 2017 4:58 PM<br><b>To:</b> Frédéric (Opensource)<br><b>Cc:</b> synth-diy mailing list<br><b>Subject:</b> Re: [sdiy] 8080-based synth reliability<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Plastic, ceramic case or ?<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On Fri, Oct 6, 2017 at 4:39 PM, Frédéric (Opensource) <<a href="mailto:marzacdev@gmail.com" target="_blank">marzacdev@gmail.com</a>> wrote:<o:p></o:p></p><p class=MsoNormal>Hi Dave.<br><br>Any idea why the 8080 died?<br><br>Fred<o:p></o:p></p><div><div><p class=MsoNormal><br><br>Le 06/10/2017 à 22:52, Michael Zacherl a écrit :<o:p></o:p></p><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><p class=MsoNormal>On 6 Oct 2017, at 22:07, Ove Ridé <<a href="mailto:nitro2k01@gmail.com" target="_blank">nitro2k01@gmail.com</a>> wrote:<br><br>You ought to document the project for posterity and 5 minutes of Hackaday fame. If you post a ROM dump or perhaps source code if it survived for all these years, the project might take on a modern life on its own by dedicated hackers. (I for one wouldn't mind looking at it.)<o:p></o:p></p></blockquote><p class=MsoNormal style='margin-bottom:12.0pt'>Oh boy, I love this kind of synchronicity!<br>The other day I dug up my old original MPF-1 to show the students:<br><br><a href="https://en.wikipedia.org/wiki/Micro-Professor_MPF-I#/media/File:Mpf-I.jpg" target="_blank">https://en.wikipedia.org/wiki/Micro-Professor_MPF-I#/media/File:Mpf-I.jpg</a><br><br>Dave, your posting definitely brings back old memories! :)<br>Very inspiring!<br><br>m.<o:p></o:p></p><p class=MsoNormal>On Friday, 6 October 2017, Dave Brown <<a href="mailto:davebr@modularsynthesis.com" target="_blank">davebr@modularsynthesis.com</a>> wrote:<br>This is definitely DIY related and somewhat synth related in that it is a digital 3 voice synthesizer. In late 1976 I designed a dedicated 8080 based three voice PWM synthesizer as a doorbell. The code was based on a program called Music for the Processor Technology Sol-20 computer. I had to disassemble the program to get it to run on a basic 8080 system using a single 2708 EPROM and two 2114 static rams. It used a simple transistor driver for the speaker. The 8080 is unmarked so I think it might even be an engineering sample.<br><br>This system has continuously run for approximately 14,870 days or nearly 356,880 hours. Well this week it died. The processor is just absolutely lifeless. I had another 8080 from the same vintage but at least marked and replacing it brought the system back to life. Note that in the 40 years the 2708 has not forgotten even though the guaranteed retention is only 10 years. I think it will outlive me.<br><br>It was a really progressive program for the time. This doorbell also includes a RS-232 interface so I could compile new music to upload to it for special occasions.<br><br>Dave<o:p></o:p></p><p class=MsoNormal>--<br><a href="http://mz.klingt.org" target="_blank">http://mz.klingt.org</a><br><br><br>_______________________________________________<br>Synth-diy mailing list<br><a href="mailto:Synth-diy@synth-diy.org" target="_blank">Synth-diy@synth-diy.org</a><br><a href="http://synth-diy.org/mailman/listinfo/synth-diy" target="_blank">http://synth-diy.org/mailman/listinfo/synth-diy</a><o:p></o:p></p><p class=MsoNormal><br>_______________________________________________<br>Synth-diy mailing list<br><a href="mailto:Synth-diy@synth-diy.org" target="_blank">Synth-diy@synth-diy.org</a><br><a href="http://synth-diy.org/mailman/listinfo/synth-diy" target="_blank">http://synth-diy.org/mailman/listinfo/synth-diy</a><o:p></o:p></p></div></div></div><p class=MsoNormal><o:p> </o:p></p></div></div></div></body></html>