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Patches and Stickers for sale here

No. 6479 ID: e8f72b hide watch expand quickreply [Reply]

>In 200-meter trials, the jetpack shaved three seconds off the best time of one test subject, which becomes a bit more impressive when you consider the extra 12 pounds of jetpack weight. The rummer also experienced a corresponding decrease in metabolic load (energy burned.) That said, it still seems a bit academic. Is three seconds and a bit of saved energy worth carting one of these things around?
Jason Kerestes, the 4MM "mastermind," noted, "if you think of a Navy SEAL or a soldier that must get in somewhere quickly —and get out just as quickly."
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>> No. 6491 ID: 4059f1
File 141096442216.png - (129.53KB , 1055x570 , Geared_Turbofan_NT_PNG.png )
It looks like it might be some sort of turbofan.
>> No. 6495 ID: 329f54
I thought the same thing, LiPo batteries and fans.
>> No. 6509 ID: 30f40a
the only thing I could think of while watching that was those electric "turbochargers" you can find on ebay you slap into your intake.
>> No. 6524 ID: 42779b
I don't think there's any fuel or combustion, which precludes the "turbo" part. It really just looks like a fan on an electric motor.

Which sounds pretty weak ass to me.
>> No. 6525 ID: 4059f1
yeah, saw on a different source that it is an electric ducted fan. Still, you can get some decent results from ducted fans.

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6444 No. 6444 ID: 0a2b37 hide watch expand quickreply [Reply]
Here we have a US Government issue Medeco Biaxial high-security lock.
It is a five or six-pin lock with a sidebar at the 3 o'clock position in the plug. The cuts on the keys are angled to interface with the angled cuts of the pins, when the correct key is inserted the pins rotate axially as they are also lifted to the sheer line, when rotated to the correct position the fingers of the sidebar may fall into grooves in the key pins allowing the sidebar to unlock. The lock also contains 2 or 3 mushroom driver pins to resist picking and hardened rods and disks in the plug to resist destructive entry methods. This lock is vulnerable to picking, impressioning, bumping and destructive methods. The lock comes with 3 keys, 2 standard and 1 control key, each is marked "U.S. Military Property Do Not Dup(licate)."
Though the Biaxial is being replaced by the Medeco M3 it is still in very common use and is also available for purchase as surplus.

Pictured from left to right is the cylinder body containing the driver pins and springs(held in by plug follower), the sidebar, the key pins, the key and the lock plug(note the hardened rods visible in the plug).
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>> No. 6467 ID: 604f11
I was more referring to breaking in both the senses of the word. But yeah I agree.
>> No. 6501 ID: d87b8d
Google Schuyler Towne and the Medicoder...

Towne created a simple tool used for aligning the Medico Biaxial's rotating pins such as to bypass the sidebar and allow the lock to be picked via conventional news. As a matter of fact, him defeating the Biaxial caused quite a stirr in locksmithing circles and is what prompted Medico to create the M3, which addresses certain flaws that allowed Mr.Towne's device to work.

I'll be honest, though -- even knowing about the medicoder, picking a biaxial is hard. The keyway is fucking tiny, so even getting a conventional pick into it is hard as fuck, much more so given that you're dealing with mushroom pins. Hard as fuck, yes...but certainly pickable assuming you have a medicoder.
>> No. 6505 ID: d94be2
I don't have time to file myself a new set of lock picks.

Anybody have any recommendations for an affordable, but rugged set? I wanna get back into this, it's my third favorite hobby.

Preferably not Southord, I want to try another company.
>> No. 6506 ID: e68bea


>> No. 6510 ID: 0a2b37
File 141136935095.jpg - (878.75KB , 3401x2721 , sm monstrum.jpg )

Those are all secondary/EDC sets, perfectly adequate and high-quality, but not really the best for regular/repeated use.


If not Southord then probably HPC or Sparrows. The latter is quite new, they're generally better quality than Southord, but there has been some stink about them using people's pick designs without giving due credit. Their Monstrum pickset is quite redunkulous.

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6494 No. 6494 ID: 697c94 hide watch quickreply [Reply]
The setting: Europe, about 7,500 years ago. Agriculture was sweeping in from the Near East, bringing early farmers into contact with hunter-gatherers who had already been living in Europe for tens of thousands of years.
Genetic and archaeological research in the last 10 years has revealed that almost all present-day Europeans descend from the mixing of these two ancient populations. But it turns out that's not the full story.

Researchers at Harvard Medical School and the University of Tübingen in Germany have now documented a genetic contribution from a third ancestor: Ancient North Eurasians. This group appears to have contributed DNA to present-day Europeans as well as to the people who travelled across the Bering Strait into the Americas more than 15,000 years ago.

"Prior to this paper, the models we had for European ancestry were two-way mixtures. We show that there are three groups," said David Reich, professor of genetics at HMS and co-senior author of the study.
"This also explains the recently discovered genetic connection between Europeans and Native Americans," Reich added. "The same Ancient North Eurasian group contributed to both of them."
The research team also discovered that ancient Near Eastern farmers and their European descendants can trace much of their ancestry to a previously unknown, even older lineage called the Basal Eurasians.
The study is published Sept. 18 in Nature.

Peering into the past

To probe the ongoing mystery of Europeans' heritage and their relationships to the rest of the world, the international research team—including co-senior author Johannes Krause, professor of archaeo- and paleogenetics at the University of Tübingen and co-director of the new Max Planck Institute for History and the Sciences in Jena, Germany—collected and sequenced the DNA of more than 2,300 present-day people from around the world and of nine ancient humans from Sweden, Luxembourg and Germany.

The ancient bones came from eight hunter-gatherers who lived about 8,000 years ago, before the arrival of farming, and one farmer from about 7,000 years ago.
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6475 No. 6475 ID: 697c94 hide watch quickreply [Reply]
Underwater excavations led by Ankara University’s Research Center for Maritime Archaeology (ANKÜSAM) have uncovered sunken ships ranging from the second century B.C. to the Ottoman period in İzmir’s Urla district.

A recent excavation uncovered a ship estimated to date back 4,000 years, which experts say would make it the oldest sunken ship to have been discovered in the Mediterranean.

Urla Port is one of Turkey’s rare underwater excavation sites. Professor Hayat Erkanal, the head of Limantepe excavations for the underwater ancient city of Klozemenai and director of ANKÜSAM, said the port dates back to the seventh century B.C. Klozemenai, he explained, was a coastal town, making it the home of many sunken ships from different eras. An earthquake in the eighth century left the city underwater.

He said the team is currently working to determine the features and correct age of its most recent shipwreck find.

There are two other sunken boats that compete for the title of the world’s oldest, Erkanal said. The Uluburun shipwreck, found off the coast of Kaş, is around 3,500 years old, while the sunken ship of Hatshepsut, the fifth pharaoh of Ancient Egypt’s 18th dynasty, is dated to be around 150 years older.

“If we confirm that the sunken ship [we have found] is 4,000 years old, it will be a very important milestone for archaeology,” Erkanal said.

Erkanal said materials removed from seawater must be cleaned of salt to prevent further decay. This process is conducted in a large restoration and conservation laboratory at the recently opened Mustafa Vehbi Koç Maritime Archaeology Research Center and Archaeopark. The process of removing a sunken ship from the water can take approximately seven to eight years, Erkanal said.
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6474 No. 6474 ID: 324c91 hide watch quickreply [Reply]
Thought to be a gigantic tomb built for the the pharaoh Khufu over a 10 to 20-year period that ended somewhere around 2560 BC, the Great Pyramid of Giza in Egypt is the single remaining vestige of the Seven Wonders of the Ancient World. When it was first built it was 146.5 metres high, before crumbling to 138.8 metres tall, where it stands now.
There are three known chambers in the Great Pyramid - the base chamber sits on the bedrock and supports the rest of the pyramid, while the upper two chambers are called the Queen’s and King’s Chambers. Extending from the north and south walls of the Queen’s Chamber are two tunnels - about 20 cm by 20 cm - that are blocked off by stone doors. No one knows what these tunnels were originally intended to do, but one theory is that they led to a secret chamber.

According to Rowan Hooper at New Scientist, researchers have tried several times to send little robots into the Great Pyramid to solve this mystery. In 1993, a robot made it 63 m up the south wall tunnel to find a small pair of stone doors set with metal pins. This was strange enough on its own, because metal was not found in any other part of the Great Pyramid, so what function was it performing here? Door handles, perhaps? Or a key?

Almost a decade after that, another robot drilled into a stone block in the tunnel and found a small, strange empty chamber that ended with a large stone block.
This year, a team of engineers led by Rob Richardson from the University of Leeds in the UK decided to further investigate this mystery, and developed a new robot to help them explore the chamber. They got it to crawl up into the tunnel, and use its flexible “micro snake” camera to see into and around all the nooks, crannies and corners. What this robot found was 4,500-year-old hieroglyphs written in red paint, and carvings in the stone that could have been made by the stone masons at the time the chamber was being built.
"If these hieroglyphs could be deciphered they could help Egyptologists work out why these mysterious shafts were built,” Richardson told Hooper at New Scientist.
"Red-painted numbers and graffiti are very common around Giza,” added Egyptologist Peter Der Manuelian from Harvard University and director of the Giza Archives at the Museum of Fine Arts in the US. "They are often masons' or work-gangs' marks, denoting numbers, dates or even the names of the gangs."

The robot was also able to get its stretchy camera in and around the mysterious empty chamber to get a look at the back of the stone door for the first time. This allowed it to film parts of the metal pins that had never been seen before, and their beautifully looped tips suggest that rather than being functional, they were probably just ornamental features.
Egyptologist Kate Spence from the University of Cambridge in the UK, who was not involved in the study, says it’s almost
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6461 No. 6461 ID: e8f72b hide watch quickreply [Reply]


>The UMD team's advance is described in today's edition of Nature Photonics. The problem, more specifically, is that T-ray detectors have needed to be kept at extremely cold temperatures to be used efficiently, as far down as -452 degrees Fahrenheit. Obviously, this makes the technology mostly impractical in its current form, and the result is what's known as the "terahertz gap," a region of the electromagnetic spectrum between microwaves and infrared light waves that lies mostly outside of our technological capabilities. Thus, T-rays are usually measured via proxies.


>Graphene behaves a bit strangely when used within a T-ray detector. When those high-frequency waves (particles) are absorbed by electrons within a graphene lattice, instead of heating the lattice up, the energized electrons refuse to release any of their new energy. "Light is absorbed by the electrons in graphene, which heat up but don’t lose their energy easily. So they remain hot while the carbon atomic lattice remains cold,” said UMD physics professor Dennis Drew in a statement.

>Eventually, those increasingly energized electrons decide to bolt from their atomic homes. Usually, when exposed to T-rays, the electrons in a material acquire energy slow enough that they're able to release the excess via photons (photons being the force-carrying particles of electrons), but here they're able to save it up until they have enough to escape entirely. This is called the “hot-electron photothermoelectric effect.” These escaping electrons are then collected as electrical current.

>The current delivered from the graphene detector material provides a signal that can be interpreted as imagery. "Terahertz imaging could reveal interesting features of the many materials with distinct absorptive and dispersive properties in this spectral range, which corresponds revealingly with biomolecular vibrations," a 2010 paper from researchers at CERN explained. "The demonstration source would allow full-field, real-time imaging of the distribution of specific proteins or water in tissue, or buried metal layers in semiconductors."

>T-rays can see through most everything, but just enough to get at the desired layer. They don't penetrate as far as microwaves, for example. They're also generally less destructive to biological tissue than X-rays. With regular old hemp poised to step in as a cheap graphene analog, the widely-deployed terahertz future may be quite close.
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6432 No. 6432 ID: 8c8194 hide watch quickreply [Reply]
Fossil fuels are made from plant matter.

Burning it puts carbon that was once in the carbon cycle back in the carbon cycle.

Why is this bad?
>> No. 6433 ID: 697c94
  Giant bugs will come back do to increase supply of oxygen as plants will be absorbing more carbon dioxide.
>> No. 6438 ID: 67f943
A carbon cycle of a set size can only work with so much "active" (=/= "activated") in the cycle at any given time. Unfortunately, there is more carbon around on the earth than can be handled or processed in the cycle. Fortunately, when in the form of fossil fuels, that carbon is "locked away" and stored, per-say, not participating in the cycle.

If we only burnt a little bit of fossil fuels every year, releasing the carbon from its "locked" form, there would be no problem, since there is some natural cycling of carbon in and out of the "locked" form anyways.
The problem starts when we start burning fossil fuels and releasing the carbon at a faster rate than the carbon cycle can store/lock it up again. This is where we are now. Some people have looked at potentially implementing some kind of "scrubbers" which help by pulling some of the excess carbon out of the atmosphere, reducing it to something the carbon cycle can naturally handle.
>> No. 6450 ID: 0a2b37
Same reason the oxygen apocalypse was bad for the cyanobacteria of the Proterozoic era. Except in reverse.

>> No. 6459 ID: 38132a
>there's around 30 l of bound chlorine gas in your body, surely it won't hurt if you release it.

File 140144392450.png - (427.83KB , 1920x1200 , HAL.png )
6098 No. 6098 ID: 22deac hide watch expand quickreply [Reply]
One desire of mine for a fairly long time now has been to come up with a customized security system. The problem is that, well, let's be honest -- $100 in ammo is a lot more fun than $100 in cheapass bullshit security equipment. Besides, a lot of the low-end stuff is a joke and a pain in the ass on top of that fact.

In light of this, my intent has been to roll my own solutions. Honestly, it sounds a lot more fun anyway. A lot of sensor devices are very basic. Ball bearings can be used to make basic tilt sensors or vibration sensors that will work fine for the ranges of input we're usually looking at. Door open/closed state sensors can be done cleverly with hall effect sensors, or even just simple wire contacts. Pressure plates aren't much different. Heck, a little digging will get you any number of DIY guides online for most any little basic device you want, including stuff like IR motion detectors.

The problem is that it can be fairly hard to determine if these items are worth a damn, and even harder to assemble them into a system that is truly worthwhile. Making the door scream when you open it is easy. Having it flash an alert on your desktop or shoot you an SMS is far, far harder.

Knowing that we've got quite an assortment of odd skillsets kicking around the chan, it dawned on me that just be possible for a collaborative effort to produce something of merit. So, ideas? Failing that, how about some advice for those of us on the shallow end of the knowledge pool? What sort of self-teaching resources for things like relevant electronics are recommended? What about high- and low-level coding, for device firmware or the centralized monitoring software?
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>> No. 6452 ID: eaed30
What was the verdict? Now that I've got a bit of money to throw around, I'm looking for POE cameras to deploy. Several internal, but preferably 3-4 outdoors.

Cameras are probably the "easiest" part of a security system I'd consider, if only because they're complex enough that I can't see it really being worth trying to roll your own unless you've got a lot of free hardware. While expensive, any security system I might conceivably make would really only interact with cameras on a "Click to see feed" level. They're not really as active as other sensors, which would actually generate alerts.

Still, they're probably the first thing I want to get, as I can pretty easily come up with a remote monitoring solution that I can keep an eye on a hell of a lot of the time right now.
>> No. 6453 ID: 7fcde8

I would disagree.

I was tasked with speccing out the camera system the client wanted at the gold mine I was at. Their budget didn't allow for the usual high-grade industrial surveillance gear, but even with 8k in the system after installation.. we had facial recognition (albeit it was simply recognizing "this is a face, snapshot") as well as surroundings change, camera occlusion, and numerous other features with warnings both on the screen and slaved into our radio system.

There's a ton of stuff that you can do with just cameras. Other sensors like proximity fences, microwave tripwires and such are nice but actually have much more false positives especially if you have significantly changing conditions where they're installed. Plus, with a suitably intelligent software suite, it can actually combination alert from triggered events.

example: overhead shot of gold room from the roof. Area of interest highlighted, clean standard for area when done established and required by work processes and procedures.

Specific timeframes (off our normal work shift, although we were onsite) it would alert in the office as well as alert via radio and would permanently record an hour prior of video from all cameras.

During normal shift, it would alert only in the office while recording all video for the gold room and associated high-concentration areas when there was motion detected starting 10min prior, stopping when there was no motion for 10 minutes.

Camera positioning provided for a full body/face shot (recorded and saved as a still shot) of anyone entering the mill facility and the locker room was outside of the mill... people entered in whatever they were wearing for their shift uniform and no carry-in baggage allowed. This allowed ease of path tracking within the facility with literally no dead zones... We took turns trying to spider-man our way around to avoid cameras and it was literally impossible with the configuration I had set up.. although it was fun to try.
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>> No. 6454 ID: eaed30
Clearly that's all way, way beyond me right now, though I'd like to find some resources that detail how to get into it. If you've got any especially good primers or ground-up type information sources, I'm all ears.

For now, though, I stick with my statement that cams are probably the most plug and play option from my perspective. Most of what you describe is analyzing footage after the fact, and ideally I'm looking for a system that will support that. Cameras that produce video in a common standard, nothing proprietary. I think that ought to allow for expansion in the future and basic functionality now.

Even if I learn a ton and roll my own system with something like a basic interactive zone map, I can start with a "click to view feed" option and build more features on top of it as I gain the skill to.

For now I've already got an old Dell Poweredge 2900 server that I could spin a VM on to act as a storage/control point, so the camera hardware itself is the big question.
>> No. 6455 ID: 7fcde8
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>Clearly that's all way, way beyond me right now, though I'd like to find some resources that detail how to get into it. If you've got any especially good primers or ground-up type information sources, I'm all ears.

>For now, though, I stick with my statement that cams are probably the most plug and play option from my perspective. Most of what you describe is analyzing footage after the fact, and ideally I'm looking for a system that will support that. Cameras that produce video in a common standard, nothing proprietary. I think that ought to allow for expansion in the future and basic functionality now.

>Even if I learn a ton and roll my own system with something like a basic interactive zone map, I can start with a "click to view feed" option and build more features on top of it as I gain the skill to.

>For now I've already got an old Dell Poweredge 2900 server that I could spin a VM on to act as a storage/control point, so the camera hardware itself is the big question.

Here's the thing. I'm just going off Geovision PC-based architecture, since other CCTV systems can either be wholly proprietary or otherwise get hinky dealing with how they're interacting with SCADA architecture... lots of commercial/industrial applications end up doing POE (power over ethernet) or other solutions specifically because they can tap into and leverage hardware infrastructure they already have.

Everything else from other manufacturers can do the same, but Geovision ends up being on the cheaper end while still performing admirably. My largest and biggest thing personally learned through experience elsewhere is that having your security/surveillance system totally stand-alone... that way, anyone being stupid (unplugging routers, unplugging cables because they want THEIR computer on, etc) doesn't fuck with your system. Sometimes that's not as much of a threat (using a tough plug that you specifically cut the nub off of for the most basic anti-tamper all the way to using strong seals or flat out lockboxing where your wiring goes to as one simple example) but in some locations it can be.

I actually had a CCTV system that I installed into the house we rented in Georgia, since we didn't live in the best neighborhood and I was getting ready to deploy and wanted to put the wife on the best security standpoint I could as far as preventative/early warning... other than moving, which was out of the question due to funds at the time. It used 2 4 port geovision camera cards, full 8 cameras with all cameras covering a full 360 plus each other and the front yard
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>> No. 6456 ID: 264fa3
+1 for Geovision. Their distribution chain is a bit... haphazard, to say the least.

But you can do a lot with their equipment. I've built everything from small remote reporting video/motion alarm systems for oil rigs, to 140 camera surveillance systems with central monitoring station using center v2 to display a dynamic matrix that only shows a camera when there is movement.

You can also make things like pc based DVR's ranging from 4 to 32 cameras each, mixing coax, ip cameras, and ip connected media centers.

Good stuff at reasonable prices.

Pair this stuff with wireless gear from Ubiquity, and you can pull together some very interesting surveillance solutions.

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6441 No. 6441 ID: 697c94 hide watch quickreply [Reply]
The taste of common sugar substitutes is often described as being much more intense than sugar, but participants in a recent study indicated that these non-nutritive sugar substitutes are no sweeter than the real thing, according to Penn State food scientists.

In the study, participants compared the taste of non-nutritive sweeteners that are often used as low- or no-calorie sugar substitutes with those of nutritive sweeteners, such as sugar, maple syrup and agave nectar. The participants indicated they could perceive the non-nutritive sweeteners—such as aspartame, marketed as NutraSweet; acesulfameK, often called AceK; and RebA, a compound found in the stevia plant—at lower concentrations than real sugar, but the intensity of these sensations was no sweeter than sugar and other nutritive sweeteners.
"While you can detect non-nutritive sweeteners at lower levels than sugar, that doesn't really tell us anything about the perceived intensity of that sweetness," said John Hayes, assistant professor, food science and director of the sensory evaluation center.

The assumption that these sweeteners are excessively sweet may be the result of confusing potency and intensity, said Hayes, who worked with Rachel Antenucci, a graduate student in food science.
"In terms of receptor biology, the potency of a substance describes the lowest concentration that activates a taste receptor, but this does not predict the intensity, or magnitude, of the response," said Hayes.
The ability to detect sweetness of non-nutritive sweeteners at low levels, then, is related to their potency, but not their intensity, he added. Sugar, on the other hand, is less potent but causes more intense sensations of sweetness.

"These ingredients are often marketed or described as 'high-intensity' sweeteners, but that's misleading," said Hayes. "Our data confirm other work showing the maximal sweetness of low-cal sweeteners is often much lower than that of table sugar or other natural sweeteners, like maple syrup."
The researchers, whose findings are available online in the International Journal of Obesity, said these sweeteners did not seem to act as supernormal stimuli—a term first used by Nobel laureate Niko Tingergen to describe exaggerated stimuli that serve as triggers for innate behaviors.

Some psychologists have suggested that supernormal stimuli and the responses they provoke could be a factor in the obesity epidemic, said Hayes.
"We have evolved to like sweetness from before birth, so some people assume so-called 'high intensity' sweeteners hijack or over-stimulate our natural drive to consume sweet foods, causing us to overeat," said Hayes. "However, this view assumes that foods we eat today are more intense than those we would have been exposed to evolutionarily, and our data imply this isn't the case.&qu
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6246 No. 6246 ID: aa85b4 hide watch expand quickreply [Reply]
My desktop is about to implode, I can feel it coming to a head. I don't got a shitton of money, barely any reserved for such frivolous things as entertainment but I'll be damned if I'll be content with my even shittier laptop.

I ask thee oh techpriests of /stem/ what parts should I scrape together and what holy programs shall I install to fortify my future rig against the tides of time? (nothing more than $600 though, programs I can just steal.)
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>> No. 6400 ID: 28f40c
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>install windows 7
>restart computer
>can't boot up without it crashing
>get a 0x460 error
God hates me. He doesn't want me to play HD vidya. It's the only explanation.
>> No. 6401 ID: 67f943
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I think that error means a corrupt boot configuration. Maybe.
How far in to the boot process does it get? Can you access the BIOS?

Try removing all unneeded peripherals. IE; Plug in your Motherboard/CPU/RAM, PSU, Keyboard, and Monitor. Nothing else.
If all goes well, it should get to the BIOS and give a "no boot device found" error message.
Now start adding components one by one, starting with the HDD. Make sure the drive is plugged in to the #1 SATA port on the motherboard, and not one that is (for some unreasonably strange reason) meant exclusively for a media device, such as a CD drive, (check your motherboard's manual).
>> No. 6402 ID: b338a2
>My desktop is about to implode, I can feel it coming to a head
I know that feeling

Motherboard might not survive the winter
>> No. 6403 ID: 28f40c
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Well, every thing works. The resolution on my TV is kinda fucking annoying, but all I really need is an AVI to DVI cable and I'll be set.
>> No. 6431 ID: 17ac4c
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About to lay some outlying weird shit I have ever seen ever real life experience on you...

Use a different usb keyboard.

I have only seen this once in 20 years of building.

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