April 2016 - vcf-midatlantic

Re: [vcf-midatlantic] Volunteer signup sheet for recording VCFEast Classes
by VAXman＠tmesis.org 12 Apr '16

12 Apr '16

Matt Patoray via vcf-midatlantic writes: >Top post here, since its not chnging the signup sheet, since I will not >be at VCF-E but here are a frew tips to make things better. > >1. Biggest pet pieve here, uninteliagable, noisy audio, at the minimum >if you are using a phone/tablet place it on something that holds the >device so therte is not a bunch of handeling noise. If possible connect >an external microphone that can be placed closer to the speaker, the >acoustics in most of those rooms are really not tjhat great and you get >a lot of room echo. > >2.2nd biggest pet peive here, if you are shooting with a >smartphone/tablet please hold/mount it in landscape mode. TV's left a >3x2 aspect ratio once John Logie Baird's mechanical TV failed. I'd use one of these: http://www.bhphotovideo.com/c/product/1210608-REG/canon_1005c002_vixia_hf_g… >3. Whoever is going to take on the editing should tell the volenteers >what format they need video in, that way you are not mixing SD,720P, >10801 and 1080P. They can be mixed but to make it work properly and look >good takes more work and a lot more rendering time. > >4. Please use a tripod, there are even tripods for smartphones, they are >kind of crappy but do help. ... and a Manfrotto tripod.

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Re: [vcf-midatlantic] Final class schedule for this Friday
by Brian L. Stuart 12 Apr '16

12 Apr '16

On Tue, 4/12/16, Brian Schenkenberger via vcf-midatlantic <vcf-midatlantic(a)lists.vintagecomputerfederation.org> wrote: > Are there any abstracts available for these classes? I feel like I'm pulling an AOL "me too" with Ian, especially since his line about being abstract applies very well to me too. My early class is Analog Computer Basics. I plan to go though the basic idea of electronic computing without bits. The first few minutes will be a quick overview of key ideas in electrical engineering. The second segment will look at using operational amplifiers to create mathematical building blocks. The remainder of the presentation will go through an example of modeling a simple physical system and illustrating it on a Comdyna GP-6. The second session I'm part of is on the ENIAC. Evan and I are basically tag-teaming about the ENIAC. I'll let Evan speak to anything he wants to say about his part of the presentation. My part will focus on the technical details of how the machine worked. I'll also be talking some about how it was programmed (primarily in its original mode of operation, but as time permits I do plan to talk a little about the instruction set architecture implemented in 1948). Several aspects of the machine's operation will be illustrated with an ENIAC simulator I've been developing over the past few months. I'll also echo Ian's offter that I'll be glad to adjust the focus and emphasis of my talks to address things that are of most interest to the audience. Hope that's helpful to anyone trying to decide which sessions to attend. BLS

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More publicity
by Evan Koblentz 12 Apr '16

12 Apr '16

Computer Science Teachers Association published my blog post about VCF. http://blog.csta.acm.org

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Re: [vcf-midatlantic] Final class schedule for this Friday
by VAXman＠tmesis.org 12 Apr '16

12 Apr '16

Steven Toth via vcf-midatlantic writes: >> >http://vcfed.org/wp/festivals/vintage-computer-festival-east/vcf-east-class… > >Wow. That's the best $20 I'll likely ever spend. Every track looks >awesome. > >Are the tracks being recorded so we can catch up on the stuff we miss? Are there any abstracts available for these classes?

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Pre VCF photos...
by Herb Johnson 12 Apr '16

12 Apr '16

If memory serves, the Cromemco Cyclops camera used an uncovered DRAM for the optical sensor. If so, that would be the most interesting construction feature of this facsimile version. Herb Johnson -- Herbert R. Johnson, New Jersey USA http://www.retrotechnology.com OR .net

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VCF in Electronic Design mag
by Evan Koblentz 12 Apr '16

12 Apr '16

http://electronicdesign.com/embedded/qa-evan-koblentz-talks-about-vintage-c…

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Final class schedule for this Friday
by Evan Koblentz 12 Apr '16

12 Apr '16

http://vcfed.org/wp/festivals/vintage-computer-festival-east/vcf-east-class…

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Re: [vcf-midatlantic] Final class schedule for this Friday
by Matt Patoray 12 Apr '16

12 Apr '16

On Tue, Apr 12, 2016 at 10:50 AM, Bill Sudbrink via vcf-midatlantic < vcf-midatlantic(a)lists.vintagecomputerfederation.org> wrote: > > > I don't know if I'll be there in time for your monitor > class, but one of the things I've always had trouble > with is how to tell where the problem lies. In > particular, image issues like "ghosting", "wavy" > images, general fuzziness. Sometimes it seems like > the source is the problem, but then you try the same > source with a different monitor and the problem is > gone. So you try the "bad" monitor with a different > source and there's no problem there either. What > the...? you ask yourself. So you put the original > monitor and source back together and the problem is > still there. Very frustrating. > > Bill S. > > > Bill, First off i am assuming that we are talking about conneciting an NTSC style source to an older NTSC CRT based monitor. I will not get into the issues of using ann LCD/Plasma to display NTSC... I am going to cover the 2 most common causes of "fuzzieness". 1. Convergance, this is where the 3 electron beams from the CRT do not meet up percicely at the shadow mask/apature grill of the CRT, thus the beams strike the wrong color of phosphor. this can easily be seen with white text or lines/boxes, you will see that in the center of the white area everything is white but then there are little color "fringes" of red, green or blue. The procedure is differnt forn diffent styles of monitors/tvs say Trinintron vs non trinitron, but if the monitor/tv has a menu system see if you can find a convergance menu (sometiems a service menu) and select the options for comvergance and alllign everything meet in the center, for convergance you leave the green alone and move the red and blue to meet green. If there are not menus you will have to get inside the monitor, for non Trinitrons the convergance adjustments are generally on the neck of the tube as a set of movable magnetic rings on the neck of the tube, they get rotated to change the allignment. Real old sets have a "Convergance Panel" inside the set with the adjustments as a large field of pots and coils. For Trinitron based monitors, they have the magnets on the neck of the CRT as wll as a "H-Stat" atjustment on the flyback, you adjust that to get things as close as you can horozontally then go to the rings on the neck. For most older monitors convergance is a compermise, it will always be best in the center and drift out twards the edges of the tube, you just get it as good as you can. 2. Focus, this is general fuzziness even when the convergance is good, as such the convergance needs to be close before focuse can be properly adjusted. This is an internal adjustment, sometimes as on Trinitron monitors the focus control is on the flyback, but on most monitors it will be genrerally in the same HV area as the flyback, you just adjust for the best results. Hope this helps. -- Matt Patoray Owner, MSP Productions KD8AMG Amateur Radio Call Sign

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Re: [vcf-midatlantic] Final class schedule for this Friday
by VAXman＠tmesis.org 12 Apr '16

12 Apr '16

Ian Primus via vcf-midatlantic writes: >I'm pretty abstract as it is, so perhaps this is redundant, but somehow >Evan talked me in to teaching two classes - I'm doing CRT monitor repair >and early Mac repair. LOL! I looked at the class schedule but there's no link to an abstract for anyone interested in any of the classes. There should be something, no matter how brief, explaining what one might hope to achieve by attending the class.

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Bill & Anthony's pre-VCF East video
by Evan Koblentz 12 Apr '16

12 Apr '16

https://youtu.be/ArvV1KPXYiA

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