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  • How Circuit Boards Are Manufactured and Tested [Video]

    - by Jason Fitzpatrick
    Circuit boards are in nearly everything: computers, cars, toys, phones, even greeting cards. Check out this tour of Printed Circuit Board (PCB) factory to see how they’re made. In the above video the owners of Base2 Electronics are watching a PCB testing machine at the factory where they purchase their boards for resale. The machine is first scanning the board to identify it in the board database and then the arms start flying as it tests individual circuits on the board. If you’re interested seeing all the steps of the manufacturing process, hit up the link below for a photo and video tour of the facility. Base2 Electronics Tour of Advanced Circuits [via Hack A Day] How To Encrypt Your Cloud-Based Drive with BoxcryptorHTG Explains: Photography with Film-Based CamerasHow to Clean Your Dirty Smartphone (Without Breaking Something)

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  • Host And Expose Application to local small network

    - by tartak
    I developed a little application (web application) using JavaEE+MySql. I try to keep some data and .. from time to time to get some reports using my data. My problem is I have to access this application from 4-5 computers in the office. They are connected through a switch. It's a typical small office network, nothing fancy. I need some advice on how to do this. I mean for a small application with no external communication is it mandatory to use an Apache machine? I'd use a simple Tomcat container on the "server machine" (which is my computer, a windows machine) and .. basically .. I would like to permit the access to my colleagues also. I don't have any knowledge about concurrency (I know mysql permits concurrent access) so I would like some configuration tips also.

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  • How to connect to Windows Server 2008 Remote Desktop with Network Level Authentication Required

    - by Lobo
    I have an Ubuntu 11.10 and I want to connect via remote desktop to a Windows Server 2008 R2. In the properties of remote desktop connection to Windows Server 2008, is set to "safer". Specifically, the selected option is "Allow connections only from computers running Remote Desktop with Network Level Authentication." In my Ubuntu, I used Remmina to connect to Windows Server 2008. Remmina can not connect to a Windows Server 2008 with the option "Network Level Authentication" (shown in the previous paragraph). The error message I Remmina returns is as follows: "Disable the connection to the server RPD: IPWINDOWSSERVER2008" How or what program I can connect by remote desktop to a Windows Server 2008 you have selected the option "Network Level Authentication"? Thanks for the help, Greetings! PD: Excuse for my English.

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  • Can't get past the Ubuntu loading screen when installing

    - by Oscar Godson
    I'm trying to install Ubuntu 11.04 onto some custom made PC that my father in law tried building. It had Windows on it, but he wants Ubuntu so he asked me to do it. I've installed Ubuntu 11.04 on a few computers no issues, but on this computer I get to the all purple screen with the Ubuntu logo and the orange and white dots that light up. Like this: The fan is also super, super loud and sounds like the whole thing is going to explode and has been running like this for 15 mins ish. Then, after about 15 mins the dots stop animating from orange to white and usually just stick at all orange. Any ideas?

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  • Installing Ubuntu 12.04 on the Hp Mini 210-2090nr

    - by Dalton Bailey
    When i got this netbook last year i planned n putting ubuntu netbook remix on it but i never did and now i can no longer booot n to windows for some reason so i finally decided to do it but after makig a usb stick with ubuntu on it it will not get to the menu where there is the black and white ubuntu logo and the option to install try and so on. I know to usb is configured correctly it will boot on other computers but on the netbook it only flashes SYSLINUX 4.06EOD..... and then flashs blue before turning black with the whit undercore in the top right corner for a very long time. any suggestions ive been told to disable acpi but i cant find it in the bios. (btw im uing 12.04 though ive tried 11.04 and used unetbootin linux live installer and universal usb installer to make the usb)

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  • User Independant Share Folder

    - by ell
    At the moment, I have a folder in my home directory that is shared on my laptop and can also be accessed by the other windows desktop pcs in my network but now I have decided to make my home folder inaccessible by other users on my laptop so other people cannot look at my files if they have a user on my laptop. I set the permissions to none for everyone apart from me. I then changed the share folder (/home/elliot/Shared) to allow all access but my windows computers and other users on my laptop cannot access it even though they have the right permission, I think this is because they don't have access to the home folder in which the Shared folder is stored. Where should I store a new Shared folder on my laptop? Should I put it as /home/Shared? Or, alternatively is there a way I can allow other users to access my /home/elliot/Shared folder even if /home/elliot is inaccessible? Thanks in advance, ell.

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  • How does Ubuntu One sync two machines with identical file content?

    - by user27449
    I have a notebook and a desktop computer, both running Ubuntu 11.10. I used to sync between the two with the help of Unison, so both computers have identical content in the Documents folder. I decided to try UbuntuOne. My question is, if I activate UbuntuOne for the two machines for the folders with identical contents, will UbuntuOne be able to recognise that, or will it sync to the cloud everything twice (and then down on the other machine). To put it another way, will I end up having two copies of everything on the machines and on the cloud, and therefore should delete the identical files on one of the machines before activating UbuntuOne, or not. Thank you, and if there is already something on the net about this, I'd be glad if somebody posted the link here.

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  • About Me

    - by Jeffrey West
    I’m new to blogging.  This is the second blog post that I have written, and before I go too much further I wanted the readers of my blog to know a bit more about me… Kid’s Stuff By trade, I am a programmer (or coder, developer, engineer, architect, etc).  I started programming when I was 12 years old.  When I was 7, we got our first ‘family’ computer – an Apple IIc.  It was great to play games on, and of course what else was a 7-year-old going to do with it.  I did have one problem with it, though.  When I put in my 5.25” floppy to play a game, sometimes, instead loading my game I would get a mysterious ‘]’ on the screen with a flashing cursor.  This, of course, was not my game.  Much like the standard ‘Microsoft fix’ is to reboot, back then you would take the floppy out, shake it, and restart the computer and pray for a different result. One day, I learned at school that I could topple my nemesis – the ‘]’ and flashing cursor – by typing ‘load’ and pressing enter.  Most of the time, this would load my game and then I would get to play.  Problem solved.  However, I began to wonder – what else can I make it do? When I was in 5th grade my dad got a bright idea to buy me a Tandy 1000HX.  He didn’t know what I was going to do with it, and neither did I.  Least of all, my mom wasn’t happy about buying a 5th grader a $1,000 computer.  Nonetheless, Over time, I learned how to write simple basic programs out of the back of my Math book: 10 x=5 20 y=6 30 PRINT x+y That was fun for all of about 5 minutes.  I needed more – more challenges, more things that I could make the computer do.  In order to quench this thirst my parents sent me to National Computer Camps in Connecticut.  It was one of the best experiences of my childhood, and I spent 3 weeks each summer after that learning BASIC, Pascal, Turbo C and some C++.  There weren’t many kids at the time who knew anything about computers, and lets just say my knowledge of and interest in computers didn’t score me many ‘cool’ points.  My experiences at NCC set me on the path that I find myself on now, and I am very thankful for the experience.  Real Life I have held various positions in the past at different levels within the IT layer cake.  I started out as a Software Developer for a startup in the Dallas, TX area building software for semiconductor testing statistical process control and sampling.  I was the second Java developer that was hired, and the ninth employee overall, so I got a great deal of experience developing software.  Since there weren’t that many people in the organization, I also got a lot of field experience which meant that if I screwed up the code, I got yelled at (figuratively) by both my boss AND the customer.  Fun Times!  What made it better was that I got to help run pilot programs in Taiwan, Singapore, Malaysia and Malta.  Getting yelled at in Taiwan is slightly less annoying that getting yelled at in Dallas… I spent the next 5 years at Accenture doing systems integration in the ‘SOA’ group.  I joined as a Consultant and left as a Senior Manager.  I started out writing code in WebLogic Integration and left after I wrapped up project where I led a team of 25 to develop the next generation of a digital media platform to deliver HD content in a digital format.  At Accenture, I had the pleasure of working with some truly amazing people – mentoring some and learning from many others – and on some incredible real-world IT projects.  Given my background with the BEA stack of products I was often called in to troubleshoot and tune WebLogic, ALBPM and ALSB installations and have logged many hours digging through thread dumps, running performance tests with SoapUI and decompiling Java classes we didn’t have the source for so I could see what was going on in the code. I am now a Senior Principal Product Manager at Oracle in the Application Grid practice.  The term ‘Application Grid’ refers to a collection of software and hardware products within Oracle that enables customers to build horizontally scalable systems.  This collection of products includes WebLogic, GlassFish, Coherence, Tuxedo and the JRockit/HotSpot JVMs (HotSprocket, maybe?).  Now, with the introduction of Exalogic it has grown to include hardware as well. Wrapping it up… I love technology and have a diverse background ranging from software development to HW and network architecture & tuning.  I have held certifications for being an Oracle Certified DBA, MSCE and Cisco Certified Network Professional (CCNP), among others and I have put those to great use over my career.  I am excited about programming & technology and I enjoy helping people learn and be successful.  If you are having challenges with WebLogic, BPM or Service Bus feel free to reach out to me and I’ll be happy to help as I have time. Thanks for stopping by!   --Jeff

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  • Deterministic replay in a modern game

    - by cloudraven
    I am doing a study in modern games graphics, and as part of the study it would be really helpful to be able to replay a sequence in the game multiple times. For example, recording a series of inputs to get the exact video sequences, but being able to replay them in different computers or different graphics configurations. I want to do this study with a couple of existing commercial games with sophisticated graphics (something released in the last 1 or 2 years if possible). I was thinking on hooking with detours or something similar, calls to time() or srand() to fix all pseudo-number generated results. It would be ideal to have a general solution that works with any game. Since admittedly that is pretty ambitious, I would be happy just having 2 or 3 games in which it is known that I can get deterministic output for a given input. In the end, I will be comparing video output, so I want to avoid noise generated by differences on each execution caused by non-determinism. Any sugestions?

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  • Theoretically bug-free programs

    - by user2443423
    I have read lot of articles which state that code can't be bug-free, and they are talking about these theorems: Halting problem Gödel's incompleteness theorem Rice's theorem Actually Rice's theorem looks like an implication of the halting problem and the halting problem is in close relationship with Gödel's incompleteness theorem. Does this imply that every program will have at least one unintended behavior? Or does it mean that it's not possible to write code to verify it? What about recursive checking? Let's assume that I have two programs. Both of them have bugs, but they don't share the same bug. What will happen if I run them concurrently? And of course most of discussions talked about Turing machines. What about linear-bounded automation (real computers)?

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  • Alan Turing Needs Your Help

    - by Chris Massey
    Well. sort of. Clearly, you are using a computer. If you are on this site, you are probably quite familiar with computers as artifacts of our modern society. Hopefully, you are also familiar with the fact that Alan Turing, logician and mathematician extraordinaire, was instrumental in laying down the foundations of modern computer science, and did a little work to help turn the tide of WWII in the Allies' favor. Hold that thought. A phenomenal collection of Turing's papers (including his first ever...(read more)

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  • How to properly set up a network bridge using bridge-utils using wlan0 as the internet "source"?

    - by Miguel Azevedo
    Hey everyone this is my first post so go easy on me. I currently have a laptop with Ubuntu Studio 12.04 Beta 2 that is supplying a wireless internet connection to a windows 7 desktop computer that's connected directly to the laptop through Ethernet. I'm using the "shared to other computers" method in network manager but I believe it doesn't work with what I want to do. I would like to have the windows computer on the same subnet as every other computer in my house (192.168.1.x) so I can use LAN applications (MIDI over WiFi, Bonjour etc.) on the windows computer without having to run a massive cable to the router. I've been googling endlessly and tried multiple configurations in the /etc/network/interfaces file without success. All of them would report "cannot add wlan0 to bridge" Is there a specific way to make this work? What am I missing? Thank you

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  • Firefox zombie process problem

    - by user52987
    When I start Firefox a Firefox zombie process starts sometimes (not always) and then goes away after a few seconds (stays sometimes until firefox is closed). This problem occurs with four computers (2 laptops and 2 desktops running ubuntu 10.04, 11.10, precise beta 1 and beta 2) I also have this same problem with other distros like Fedora 16, Linux mint 12, Debian 6 and Arch Linux. Thunderbird is also affected by this zombie process problem. Firefox safe mode does NOT help! Can someone help me to fix this problem? If you are affected by this bug please click "this bug affects me" on launchpad. My bug report (screenshot included)

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  • Mirroring Ubuntu on several systems in a computer lab

    - by Harvey Steck
    I am working in a new refugee school where the only Internet service available is a slow satellite connection. We are about to set up a computer lab (already have desktop systems and am about to install Ubuntu on them). I'm a newbie when it comes to Linux, but it seems a better alternative than pirated copies of Windows. I'd like to set up one Ubuntu system, and then mirror that system on perhaps ten to twenty other systems (all of which would be on an ethernet network). I expect to have an internet connection on the one system that I set up, but then it may be difficult to have enough bandwidth to go through all the same steps on the other ten systems. Can I set up the other ten or twenty computers to get all of their updates/upgrades/configuration from one master system? Can I also set things up so that students cannot change the configuration, install new programs, etc.? Appreciate any help you can give. -- Harvey

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  • Is code that terminates on a random condition guaranteed to terminate?

    - by Simon Campbell
    If I had a code which terminated based on if a random number generator returned a result (as follows), would it be 100% certain that the code would terminate if it was allowed to run forever. while (random(MAX_NUMBER) != 0): // random returns a random number between 0 and MAX_NUMBER print('Hello World') I am also interested in any distinctions between purely random and the deterministic random that computers generally use. Assume the seed is not able to be known in the case of the deterministic random. Naively it could be suggested that the code will exit, after all every number has some possibility and all of time for that possibility to be exercised. On the other hand it could be argued that there is the random chance it may not ever meet the exit condition-- the generator could generate 1 'randomly' until infinity. (I suppose one would question the validity of the random number generator if it was a deterministic generator returning only 1's 'randomly' though)

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  • Online training modules / programs for best software engineering practices?

    - by Steve
    We're taking over a team in a foreign country and the programming standards there aren't up to par with US standards. Folks there lack the formal training and basic understanding of computing concepts of databases, how computers work, what good software engineering practices are. Short of sending these ppl to college again, are there good online courses available that we can enroll them into so that they can upgrade their skills? I am specifically looking for online training courses, but recommendations for books are also welcome. This is language-agnostic.

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  • wireless connection will not authenticate with verizon adsl router

    - by eric
    hello, i have ubunto 10.10 running on an old dell xps system. when i set it up i had internet through my home wifi router on my cable modem. now the dell is at another home with an ADSL wifi router from verizon. we have entered the ssid and wep key as given from the adsl router. the other windows computers connect with the wep key and automatic detection. the ubuntu dell detects the connection but does not autenticate, keeps asking for wep key. i have tried diferent settings regarding wep, wpa, wep with hex and asci, still no results. what am i doing wrong? help please. thanks.

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  • Latest Ubuntu 13: Can't add more than four keyboard layouts

    - by Woofi Alakhi
    Yes, I read this article. But my questions are: I would like to try this, but I see they've written there something with "gnome" in the script. In my Ubuntu, 13.04, I have Unity. What do I do? I would have to do this for four x four keyboard layouts (to have 13 keyboard layouts). Your script, however, is designed for two x four keyboard layouts. How do I get the four x four? I would really appreciate your tips and hints on this. And I would kindly ask you to keep it simple, if possible, because I'm really no expert in both Ubuntu and computers in general.

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  • Is it true that first versions of C compilers ran for dozens of minutes and required swapping floppy disks between stages?

    - by sharptooth
    Inspired by this question. I heard that some very very early versions of C compilers for personal computers (I guess it's around 1980) resided on two or three floppy disks and so in order to compile a program one had to first insert the disk with "first pass", run the "first pass", then change to the disk with "second pass", run that, then do the same for the "third pass". Each pass ran for dozens of minutes so the developer lost lots of time in case of even a typo. How realistic is that claim? What were actual figures and details?

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  • Backup files with rsync: error 23

    - by maria
    Hi I'm trying to make a backup of my /home to transfer all data from one computer to another. I wanted to save the backup on the same computer and than transfere it to another one. For safety reasons, I'm trying to learn how does it work on the computer without a lot of data (the new one) to be sure I won't delete something instead of copying it. I've run in terminal: sudo rsync -avz /home/maria /home/guest/backup and I had as the result: sent 58797801 bytes received 23050 bytes 4705668.08 bytes/sec total size is 100202958 speedup is 1.70 rsync error: some files/attrs were not transferred (see previous errors) (code 23) at main.c(1060) [sender=3.0.7] I've tried once again, with the same result. I have no idea, which files were not transferred, what makes the whole backup useless for me (I wanted to do it automatically in order not to forget about something and loose it). On both computers I have the same system (Ubuntu 10.04). Rsync version: 3.0.7-1ubuntu1. Thanks for any tips

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  • How to share internet connection and making the client accessible over the lan

    - by Dario Silva Moran
    I've a Pc with Ubuntu 14.04 connected to a linkys router through wlan0, and I'd like to share internet connection to an AVR with ethernet port. This is pretty simple if only internet connection is required for the AVR: actually, creating an ethernet connection as "Shared with other computers" and setting up the AVR IP configuration to use DHCP works just fine, but that makes a private class A lan between those two; of course ip addresses are not in the range of the LAN the router is managing. So, I tried with static ip on both sides (Ubuntu eth0 and AVR ip). Tried many combinations, none of them work to provide Internet access to the AVR and at the same time make the AVR accessible over the network through his static ip address (say, 192.168.0.110). Any tips around to share??

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  • Beginner Geek: How to Use Multiple Monitors to Be More Productive

    - by Chris Hoffman
    Many people swear by multiple monitors, whether they’re geeks or just people who need to be productive. Why use just one monitor when you can use two or more and see more at once? Additional monitors allow you to expand your desktop, getting more screen real estate for your open programs. Windows makes it very easy to set up additional monitors, and your computer probably has the necessary ports. Why Use Multiple Monitors? Multiple monitors give you more screen real estate. Hook up multiple monitors to a computer and you can move your mouse back and forth between them, dragging programs between monitors as if you had an extra-large desktop. People who swear by multiple monitors use them to display multiple things on-screen at a time. Rather than Alt+Tabbing and task switching to glance at another window, you can just look over with your eyes and then look back to the program you’re using. Some examples of use cases for multiple monitors include: Coders who want to view their code on one display with the other display reserved for documentation. They can just glance over at the documentation and look back at their primary workspace. Anyone who needs to view something while working. Viewing a web page while writing an email, viewing another document while writing an something, or working with two large spreadsheets and having both visible at once. People who need to keep an eye on information, whether it’s email or up-to-date statistics, while working. Gamers who want to see more of the game world, extending the game across multiple displays. Geeks who just want to watch a video on one screen while doing something else on the other screen. Hooking Up Multiple Monitors Hooking up an additional monitor to your computer should be very simple. Most new computers come with more than one port for a monitor — whether DVI, HDMI, the older VGA port, or a mix. Some computers may include splitter cables that allow you to connect multiple monitors to a single port. Most laptops also come with ports that allow you to hook up an external monitor. Plug a monitor into your laptop’s DVI or VGA port and Windows will allow you to use both your laptop’s integrated display and the external monitor at once. This all depends on the ports your computer has and how your monitor connects. If you have an old VGA monitor lying around and you have a modern laptop with only DVI or HDMI connectors, you may need an adapter that allows you to plug your monitor’s VGA cable into the new port. Be sure to take your computer’s ports into account before you get another monitor for it. Managing Multiple Monitors With Windows Windows makes using multiple monitors easy. Just plug the monitor into the appropriate port on your computer and Windows should automatically extend your desktop onto it. You can now just drag and drop windows between monitors. To control how this works, right-click your Windows desktop and select Screen resolution. Choose an option from the Multiple displays box. The Extend option extends your desktop onto an additional monitor, while the other options are mainly useful if you’re using an additional monitor for presentations — for example, you could mirror your laptop’s desktop onto a large monitor or blank your laptop’s screen while it’s connected to a larger display. Be sure to arrange your monitors properly so Windows understands how your monitors are physically positioned. Windows 8 allows you to extend your Windows taskbar across multiple monitors. You’ll find this option in the taskbar’s options window — right-click the taskbar and select Properties. You can also choose where you want Windows to display taskbar buttons for open programs — on any monitor’s taskbar or only on the taskbar on the associated monitor. Windows 7 doesn’t have these convenient features built-in — your second monitor won’t have a taskbar. To extend your taskbar onto an additional monitor, you’ll need a third-party utility like the free and open-source Dual Monitor Taskbar. If you just have a single monitor, you can also use the Aero Snap feature to quickly place multiple Windows applications side by side. On Windows 7 or 8, press Windows Key + Left or Windows Key + Right to make the current window take up the left or right half of your display. You could also drag any window’s title bar to the left or right edges of your screen and release the window. How useful this feature is depends on your monitor’s size and resolution. If you have a large, high-resolution monitor, it will allow you to see a lot. If you have a smaller laptop monitor with the seemingly standard 1366×768 resolution, you won’t be able to see much of each snapped window at once, so snapping windows may not be practical. Image Credit: Chance Reecher on Flickr, Camp Atterbury Joint Maneuver Training Center on Flickr, Xavier Caballe on Flickr     

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  • Moving from local machine to group web development environment

    - by Djave
    I'm a freelancer who currently creates websites locally using something like MAMP to test websites locally before pushing them live with FTP. I'm looking at taking on my first employee, and I would need to be able to work on websites with them simultaneously. Can anyone explain or provide links to some good documentation on team workflow, or some key phrases I should be googling to get started on my set up? Unlike a lot of the stackoverflow community I've never worked in a dev team, large or small as I'm self taught so just need to know where to start. At present I'm thinking I need an extra computer to use as a server, then use Git or some such to version control files on that computer, as well as installing apache on it so it can be viewed by any computers in my current home network. Is this heading down the right track?

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  • How much is modern programming still tied to underyling digital logic?

    - by New Talk
    First of all: I've got no academic background. I'm working primarily with Java and Spring and I'm also fond of web programming and relational databases. I hope I'm using the right terms and I hope that this vague question makes some sense. Today the following question came to my mind: How much is modern programming still tied to the underlying digital logic? With modern programming I mean concepts like OOP, AOP, Java 7, AJAX, … I hope you get the idea. Do they no longer need the digital logic with which computers are working internally? Or is binary logic still ubiquitous when programming this way? If I'd change the inner workings of a computer overnight, would it matter, because my programming techniques are already that abstract? P. S.: With digital logic I mean the physical representation of everything "inside" the computer as zeroes and ones. Changed "binary" to "digital".

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  • Et si Apple rachetait le fournisseur de puces de ses principaux concurrents ? L'hypothèse est sérieu

    Et si Apple rachetait ARM, le fournisseur de puces de ses concurrents ? L'hypothèse est sérieusement envisagée dans les milieux financiers Soyons clairs. Il s'agit d'une rumeur. Mais une rumeur persistante qui ne cesse de faire le tour de la City de Londres. Résultat, ce « bruit qui court » a fait bondir le cours d'ARM, la joint-venture fondée entre Acorn Computers, Apple et VLSI Technology, de +8 points en une seule et unique journée. ARM est la holding qui possède la technologie des célèbres puces qui équipent les teminaux de Nokia, Samsung, HTC (avec lequel il est en procès), la Nintendo DS ou encore la PSP de Sony (pour ne citer que ceux-ci). Bref, autant de concurrents...

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