Article View: sci.electronics.design
Article #1957Re: Interview with Dave Cochran from HP Labs
From: Joerg
Date: Fri, 26 Oct 2007 01:00
Date: Fri, 26 Oct 2007 01:00
33 lines
2835 bytes
2835 bytes
John Larkin wrote: > On Tue, 23 Oct 2007 15:11:16 -0700, "David L. Jones" > <altzone@gmail.com> wrote: > >> For those interested, here is a 1 hour interview with Dave Cochran >>from HP Labs, the designer of HP's first digital voltmeter and the >> early calculators including the HP 35. The interview is in honor of >> the 35th anniversary of the HP 35. >> >> http://www.viddler.com/explore/sleibson/videos/2/ >> >> Dave. > > I would love to contact any surviving HP calculator designers from > that era. I have two dead 9100's that I'll either fix (if I can find > schematics) or toss into the dumpster (if I can't.) > Are they totally dead? Sometimes it helps to hold a scope probe to a supply rail here or there. That'll show if it's missing somewhere or a cap has dried out. If not completely dead: Check the wire braid core connections. I have seen wire ends corroded away at the solder joints, maybe from flux residue (wasn't HP though). Gear from this era also had large crystals where the innards could fall off if bumped too hard or the silver on there has blackened and lost contact (scope will show missing clock). Other than that, I am sure the Russians have got the schematics ... -- Regards, Joerg http://www.analogconsultants.com/
Technical Details
Message-ID:
<A_aUi.2640$Bk.2222@newssvr19.news.prodigy.net>Path:
arc1-ca.pugleaf.net!g2news2.google.com!news3.google.com!news2.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!newshub.sdsu.edu!newscon04.news.prodigy.net!prodigy.net!newsdst01.news.prodigy.net!prodigy.com!postmaster.news.prodigy.com!newssvr19.news.prodigy.net.POSTED!78df62d6!not-for-mailReferences:
<1193177476.780035.179220@y27g2000pre.googlegroups.com> <otbth35qk4uda0095l328kr2tcaj5160u1@4ax.com>Show Full Headers
Complete Article Headers
X-Google-Thread: 112d1e,b8e2f6e184e14320 X-Google-Thread: 103407,b8e2f6e184e14320 X-Google-Attributes: gid112d1e,gid103407,public,usenet X-Google-Language: ENGLISH,ASCII-7-bit Path: arc1-ca.pugleaf.net!g2news2.google.com!news3.google.com!news2.google.com!border1.nntp.dca.giganews.com!nntp.giganews.com!newshub.sdsu.edu!newscon04.news.prodigy.net!prodigy.net!newsdst01.news.prodigy.net!prodigy.com!postmaster.news.prodigy.com!newssvr19.news.prodigy.net.POSTED!78df62d6!not-for-mail From: Joerg <notthisjoergsch@removethispacbell.net> User-Agent: Thunderbird 2.0.0.6 (Windows/20070728) MIME-Version: 1.0 Newsgroups: sci.electronics.design,aus.electronics Subject: Re: Interview with Dave Cochran from HP Labs References: <1193177476.780035.179220@y27g2000pre.googlegroups.com> <otbth35qk4uda0095l328kr2tcaj5160u1@4ax.com> In-Reply-To: <otbth35qk4uda0095l328kr2tcaj5160u1@4ax.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Lines: 33 Message-ID: <A_aUi.2640$Bk.2222@newssvr19.news.prodigy.net> NNTP-Posting-Host: 75.26.189.5 X-Complaints-To: abuse@prodigy.net X-Trace: newssvr19.news.prodigy.net 1193360416 ST000 75.26.189.5 (Thu, 25 Oct 2007 21:00:16 EDT) NNTP-Posting-Date: Thu, 25 Oct 2007 21:00:16 EDT Organization: AT&T http://yahoo.sbc.com X-UserInfo1: TSU[@SNDZJWWSUD[MBIDM^P@VZ\LPCXLLBWLOOAF@YUDUWYAKVUOPCW[ML\JXUCKVFDYZKBMSFX^OMSAFNTINTDDMVW[X\THOPXZRVOCJTUTPC\_JSBVX\KAOTBAJBVMZTYAKMNLDI_MFDSSOLXINH__FS^\WQGHGI^C@E[A_CF\AQLDQ\BTMPLDFNVUQ_VM Date: Thu, 25 Oct 2007 18:00:04 -0700