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But I made a replacement circuit using modern surface mount components to replace the failed gate, and in the end it worked very well, yiedling the original performance. All three have power supply problems and are not yet working. The two machines share very similar mechanical aspects, and use the same technology to do their jobs. It also seems that the HP 5081-3011 that failed in my instrument is prone to failure and is bad in mnay other instruments. These three calculators use CRTs as the display. The Singer/Friden 1115 is a stablemate of the Singer/Friden 1114, with a goal of reducing the sticker shock associated with electronic calculator technology of the late 1960's and early 1970's. The Model 2201 Programmatic Flexowriter described here was built after the Singer purchase, so it represents a mature machine, far more streamlined in styling than the machines of the 1950s. Which is great when they work, and terrible when they don't, as in my instrument, because you cannot find replacements. Friden (the calculator company) purchased CCC in the 1950s and was, in turn, purchased by Singer in 1965. The secret of the exceptional performance comes from HP proprietary ECL ICs, developed specifically for this instrument. The very unique leading and trailing edge capabilities, together with the speed, make them ideal when working with core memory, and that is indeed how we made the core memory video.Īnd this is all achieved by superb analog design. You also get complementary outputs, with optional polarity inversion and adjustable DC offset. More over, both the leading and trailing edge rise times are independently adjustable. It offers pulses down to 2 ns with 1 ns rise time up to 250 MHz repetition rate. Suddenly lots of New York City consultants descended from Singer - quasi-executives who repeatedly reorganized the company. Friden had been run locally (in San Leandro, California - just up from the future Silicon Valley). favorite this post Dec 6 CONSEW 1,400 (fremont / union city / newark) pic hide this posting restore restore this posting. In 1964, Friden was sold to Singer - the same folks who made sewing machines.
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Biering-Srensen, F Bryden, A Curt, A Friden, J Harvey, L A Mulcahey, M J. The HP 8082A is from 1974, but you would not know it from its specs. Rare Vintage 1970s Singer-Friden Electronic Calculator Carrying Case 30 (fremont / union city / newark) pic hide this posting restore restore this posting. Neural dynamics of Karaoke-like voice imitation in singing performance.