test-drb August 2006

test-drb@ccmp.vtda.org

216 participants
517 discussions

SMT hobby projects (was Re: group buy for homebrew CPUs?)

by aliensrcooluk＠yahoo.co.uk

--- Dave McGuire <mcguire at neurotica.com> wrote: >> snip << > > I bought a pneumatic solder paste pump for $75, > and two different > very high-end hot air pencils for $50 and $120, al l > on eBay over the > past several years. The stuff is out there. $50 > for an air pencil > which will likely run for decades is not a bad > investment in my opinion. > > -Dave > > -- > Dave McGuire > Cape Coral, FL > As a newish member and someone not experienced in circuit board repairs/modification, could someone please explain what they (the pneumatic solder paste pump and the hot-air pencil) do, please? Regards, Andrew B aliensrcooluk at yahoo.co.uk

18 years, 4 months

Questions on convergence...

by newyork.techie＠gmail.com

well ok then, if that is the case, does anyone know of anyone who may have the manual for the specific model I had mentioned? Hitachi CM2111MJ 512? John Boffemmyer IV

18 years, 4 months

SMT techniques (was Re: group buy for homebrew CPUs?)

by ethan.dicks＠gmail.com

On 8/12/06, woodelf <bfranchuk at jetnet.ab.ca> wrote: > Still I would like to see in surface mount --- > tiny Flip/Clips and see how small you can build > a PDP-{Favorate number}. I _have_ thought about that for replacement -8/L and -8/i boards - design a simple board with, say, 4 to 6 16-pin SO pads and decoupling caps and a dual row of jumper pads to cross-connect the edge fingers to the various chip pads to be able to replicate, say, an M111 vs an M117. The "problem" is that I doubt you could get real TTL (not LS-TTL) parts in SO. I haven't experimented with replacing TTL with LS parts in any of my -8s, so I don't know if there would be any issues or not. So far, I've always had enough of the right things on hand when I go to replace a chip on an M-series module. I would think that the dimensions could be on the order of 2 x the size of just the area of the fingers. The advantage, of course, is that it would be easy to make a large number of these on one PCB panel, reducing per-unit costs. Using one (or maybe two at most) base designs would also help quantity issues. You could sit down one day and make a stack of a dozen M111s, then make two dozen M113s the next day with the same PCB; just add the right SO-parts and configure the jumpers in the right order, and there you are. -ethan

18 years, 4 months

Asynch designs (OT)

by compoobah＠valleyimplants.com

> Yeah, they've been around for years. It's illegal to have anything capable of >receiving TV broadcasts in the UK without having a licence (about 160GBP/year, >approx $140US). Doesn't matter if the equipment isn't switched on - if it's >capable of receiving a signal then a licence is needed. They're becoming worse then! It used to be black&white was exempted from the tax. What happened to the pound? used to be substantially more valuable than the dollar.

18 years, 4 months

NeXT users: Trillium speech products?

by THX1138＠dakotacom.net

Hi, Has anyone played with/auditioned Trillium's speech product(s)? They had an articulatory synthesizer that ran on cubes (?). I would be very interested in hearing about the quality of the speech produced, as well as any comments on where the product fell short. Thanks! --don

18 years, 4 months

KVMs

by compoobah＠valleyimplants.com

And lo, Don spake thusly > Hmmm... my U10 has VGVA and a 13W3. I assume one >overrides the other? They are two seperate framebuffers, and can be used for dual-heading. The 13w3 is either a Creator/ffb or an Elite3d, and will be much more satisfactory than the PGX (ATi) onboard.

18 years, 4 months

NCD NC2085AA monitor

by THX1138＠dakotacom.net

Hi, I have several of these monitors on my NCD-19c's. I'm *sure* they are a rebadged somethingorother (since the 2085 number is the same as an old RasterOps monitor I have long since discarded). *But*, like many rebadged products, it appears to be slightly different than it's sibling products. I've not been able to find any literature that would help me sort out some of the operating characteristics. Notably, how to "adjust" the screen saver function. (perhaps it is NOT adjustable on this monitor?) Pointers or first-hand experience would be welcome :> Thanks! --don

18 years, 4 months

cctalk Digest, Vol 36, Issue 40

by ken＠seefried.com

From: "Jay West" <jwest at classiccmp.org> >If we were gonna do a homebrew CPU, I'd sure like to see it done with >something akin to AMD 2901's. Why not build a retro cpu out of a retro >technology? Do 49c402s (4 x 2901 in PGA) or 59032s (16 x 2901 in PGA) count? Ken

18 years, 4 months

async designs

by ken＠seefried.com

From: Jeff Walther <trag at io.com> > Do > espionage types really try to sense what a processor is doing > remotely, based on the EM emissions from the chip? Yes. For example: https://www.iaik.tugraz.at/research/sca-lab/publications/pdf/Mangard2003Expl oitingRadiatedEmissions.pdf Abstract The conducted and radiated emissions of integrated circuits can not only cause interferences between electronic devices, but they also pose a security problem. The emissions of an IC executing a cryptographic algorithm contain information about the secret key used in the IC. This article gives a short introduction on how the key-dependent emissions of a cryptographic IC can be exploited. Based on two case studies, we show that the secret key used in an IC can be revealed based on measuring radiated emissions in the near and in the far field. Additionally, we discuss how the measurement setups used for the case studies can be improved to execute more advanced attacks.

18 years, 4 months

Questions on convergence...

by Watzman＠neo.rr.com

Convergence is the adjustment by which a monitor or TV properly overlaps the 3 separate red, blue and green images to produce a proper color image. It applies to all CRT based TV sets and monitors except those using a single image forming module for all 3 colors (e.g. DLP and most (but not all) LCD projectors, and LCD and plasma screens). Normally there are two steps, the first is "static convergence" in which the 3 images (red, blue and green) are adjusted to overlap at the exact center of the screen. The second is dynamic convergence in which the rest of the screen is "converged". Note that "perfect" convergence is generally not possible, but modern devices get very close. Also note that on some newer CRTs, some or all of the convergence adjustments are fixed at the factory and cannot be adjusted. Static convergence is usually adjusted using magnets on the CRT neck (again, common practice today is that these are set at the factory and then epoxy glued). Dynamic convergence is complex, if it's adjustable at all there can be as many as 30-40 controls effecting different colors in different parts of the screen. You also need a test pattern generator to make this adjustment (although on a computer (vs. a TV), you might be able to do it with a black screen and the letter "H" in various places). I can't give you any help for your specific device, you need to locate a service manual or you probably won't be able to do much with it.

18 years, 4 months

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test-drb August 2006