Thread View: alt.folklore.computers
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Started by hanc...
Fri, 11 May 2018 18:18
A must have: VARIABLE BREAKPOINT, VARIABLE SLOPE DIODE FUNCTION GENERATOR (EAI 1964)
Author: hanc...
Date: Fri, 11 May 2018 18:18
Date: Fri, 11 May 2018 18:18
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To be honest, I have no idea what this 1964 analog device does, nor what any of the following means: VARIABLE BREAKPOINTS TEMPERATURE COMPENSATION for THERMAL DRIFT in DIODES PARALLAX ADJUSTMENT CENTRAL SLOPE ADJUSTMENT SOLID STATE DESIGN DIRECTLY INTERCHANGEABLE with EXISTING FIXED BREAKPOINT DFG UNITS WIDE COMPUTING BANDWIDTH UNLIMITED RESOLUTION (Ok, my old rangefinder camera had "parallax" correction in the viewfinder to differentiate between close and far objects.) Anyway, this is an offering by EAI, which made analog computers. The brochure contains detailed performance specs. The full brochure is available for view at: http://www.bitsavers.org/pdf/eai/tr-48/modules/PIR64089_Variable_Breakpoint_Variable_Slope_Diode_Function_Generator_Brochure_Jun64.pdf
Re: A must have: VARIABLE BREAKPOINT, VARIABLE SLOPE DIODE FUNCTION GENERATOR (EAI 1964)
Author: Quadibloc
Date: Fri, 11 May 2018 19:05
Date: Fri, 11 May 2018 19:05
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I see the brochure was typeset using a Vari-Typer. A function generator produces a signal the waveform of which has a desired shape. John Savard
Re: A must have: VARIABLE BREAKPOINT, VARIABLE SLOPE DIODE FUNCTION GENERATOR (EAI 1964)
Author: hanc...
Date: Sat, 12 May 2018 18:59
Date: Sat, 12 May 2018 18:59
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On Friday, May 11, 2018 at 3:05:09 PM UTC-4, Quadibloc wrote: > I see the brochure was typeset using a Vari-Typer. What is a "vari-typer"? It appears the brochure's text had two different typefaces, one for the body, and one for the sub-headings. The front page has large type. > A function generator produces a signal the waveform of which has a desired shape. I must admit I forgot a lot of that stuff about functions. Learned it a long time ago, but never used it.
Re: A must have: VARIABLE BREAKPOINT, VARIABLE SLOPE DIODE FUNCTION GENERATOR (EAI 1964)
Author: Quadibloc
Date: Sun, 13 May 2018 01:49
Date: Sun, 13 May 2018 01:49
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On Saturday, May 12, 2018 at 12:59:57 PM UTC-6, han...@bbs.cpcn.com wrote: > What is a "vari-typer"? This is a good page: https://oztypewriter.blogspot.ca/2012/11/on-this-day-in-typewriter-history-raaks.html Basically: It has interchangeable type elements, like an IBM Selectric. It also does proportional spacing, in four sizes. But the unit system is crude, similar to that on an IBM Executive typebar typewriter, but with the 5-unit characters squeezed to only 4 units. Unlike a Selectric, it isn't as similar to a regular typewriter. It has a "three-bank keyboard"; that is, it has fewer keys, and you have to use a third shift to type numbers. Some old typewriters were like that too. But unlike a normal typewriter, the keys on a Vari-Typer needed a lot of force to press, and so it wasn't comparable to a normal typewriter (i.e. an Underwood 5 manual, let alone an electric typebar typewriter) the way a Selectric was. This page pictures an older one at the top, but the ones I had are pictured further down: http://site.xavier.edu/polt/typewriters/varityper.html This page pictures a very old one only: http://americanhistory.si.edu/collections/search/object/nmah_849997 This page pictures later printing technologies made by the same company, as well as the kind of Vari-Typer I meant: https://oztypewriter.blogspot.ca/2015/01/varitypers-century-of-typesetting.html John Savard
Re: A must have: VARIABLE BREAKPOINT, VARIABLE SLOPE DIODE FUNCTION GENERATOR (EAI 1964)
Author: Quadibloc
Date: Sun, 13 May 2018 01:52
Date: Sun, 13 May 2018 01:52
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And on the Internet Archive, you can get a manual for one of the later models: https://archive.org/details/VariTyperOperatorsInstructionsAndReferenceManualVT3217 and a catalog of the proportionally-spaced type faces available for it: https://archive.org/details/varityper_typefaces_1967 John Savard
Re: A must have: VARIABLE BREAKPOINT, VARIABLE SLOPE DIODE FUNCTION GENERATOR (EAI 1964)
Author: hanc...
Date: Mon, 14 May 2018 20:00
Date: Mon, 14 May 2018 20:00
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On Saturday, May 12, 2018 at 9:52:09 PM UTC-4, Quadibloc wrote: > And on the Internet Archive, you can get a manual for one of the later models: > > https://archive.org/details/VariTyperOperatorsInstructionsAndReferenceManualVT3217 > > and a catalog of the proportionally-spaced type faces available for it: > > https://archive.org/details/varityper_typefaces_1967 Interesting, thanks.
Re: A must have: VARIABLE BREAKPOINT, VARIABLE SLOPE DIODE FUNCTION GENERATOR (EAI 1964)
Author: Quadibloc
Date: Tue, 15 May 2018 15:08
Date: Tue, 15 May 2018 15:08
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On Monday, May 14, 2018 at 2:00:51 PM UTC-6, han...@bbs.cpcn.com wrote: > Interesting, thanks. You're welcome. When I saw no reply from anyone for a while, I had thought I had given more information than anyone else could be interested in. John Savard
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