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  • PC boot: dl register and drive number

    - by kikou
    I read somewhere in the internet that, before jumping to 0x7c00, the BIOS loads into %dl the "drive number" of the booted device. But what is this "drive number"? Each device attached to the computer is assigned a number by the BIOS? If so, how can I know which number is a given device assigned to? Reading GRUB's source code I found when %dl has bits 0x80 and 0x70 set, it overwrites the whole register with 0x80. Why is that? Here is the code: jmp 3f /* grub-setup may overwrite this jump */ testb $0x80, %dl jz 2f 3: /* Ignore %dl different from 0-0x0f and 0x80-0x8f. */ testb $0x70, %dl jz 1f 2: movb $0x80, %dl 1: By the way. Is there any detailed resource on the boot process of PC's in the web? Specially about what the BIOS does before giving the control to the bootloader and also the standard codes used to communicate with it (like that "drive numer"). I was hoping to write my own bootloader and everything I found is a bit too vague, not technical enough to the point of informing of the exact state of the computer when my bootloader starts to run.

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  • View state is not getting in the Page PreInit event

    - by Jibu P C_Adoor
    Hii,, I need a help. I have a master page and i am changing the masterpage file property to some other master page dynamically in the page PreInit event and that changing url is taken from a viewstate. but the view state is not getting in the pre init event. If you finding any solution regarding this pls help me....

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  • What to have in mind when building a AJAX-based webapp

    - by Industrial
    Hi everyone, We're in the first steps of what will be a AJAX-based webapp where information and generated HTML will be sent backwards and forwards with the help of JSON/POST techniques. We're able to get the data out quickly without putting to much load on the database with the help of a cache-layer that features memcached as well as disc-based cache. Besides that - what's essential to have in mind when designing AJAX heavy webapps? Thanks a lot,

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  • best book to start XML and Html5?

    - by asad26
    hey every one can some one help that , how can start XML and Html and what i have to start first and what steps should I take , and because I know Objective c as iphone programmer but i what to know more about web base application so please some one help me with steps should I take and as beginner? thanks

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  • how to delete all files in a folder, but not the folder itself?

    - by Frost Li
    I try to delete all files including subdirectories in a folder: NSFileManager *deleteMgr = [NSFileManager defaultManager]; NSString *path = @"~/test/"; [deleteMgr removeItemAtPath:path error:&error]; And it deletes everything including the folder itself. But what I expect is an empty folder. Could anyone please help me what did I do wrong? Really thanks your help! :)

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  • Facebook "like" button for blogger

    - by Veraa
    Hi, i have been looking for a javascript code which is like the facebook "like" widget to put in my blogger site. The examples of the buttons are like in the following website, http://textsfromlastnight.com/ Where people are able to flag the "Good Nights" or "Bad Nights". I have no experienced in writing scripts neither do i have any script writing programs, so was wondering if any people can help with the scripts, or maybe tutorials would be of great help! Thanks!

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  • How to create workspace in TFS

    - by kumar
    Hi, I followed this way. To create a workspace to manage your source-controlled files 1. From the File menu, select Source Control, and then click Workspaces. 2. In the Manage Workspaces dialog box, click Add. 3. Type a descriptive name in the Name box, enter a comment describing the new workspace in the Comment box, and provide alternative Owner and Computer name values, as necessary. 4. Under Working Folders, in the Source Control Folder box, click the text box and then the ellipsis (…). 5. In the Browse for Folder dialog box, select a server folder, and then click OK. 6. Under Working Folders, in the Local Folder box, click the text box, and then click the ellipsis (…). 7. In the Browse for Folder dialog box, select a folder on your computer, and then click OK. 8. In the Add Workspace dialog box, click OK to create the workspace. 9. In the Manage Workspaces dialog box, click Close. when I click OK button it should get all the folder from TFS to my Local machine? but its not doing that after clcking ok and Close nothing is happening and my local floder does not contain this files tooo? Thanks

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  • VB.NET CInt(Long) behaving differently in 32- and 64-bit environments

    - by LocoDelAssembly
    Hello everybody, this is my first message here. Today I had a problem converting a Long (Int64) to an Integer (Int32). The problem is that my code was always working in 32-bit environments, but when I try THE SAME executable in a 64-bit computer it crashes with a System.OverflowException exception. I've prepared this test code in VS2008 in a new project with default settings: Module Module1 Sub Main() Dim alpha As Long = -1 Dim delta As Integer Try delta = CInt(alpha And UInteger.MaxValue) Console.WriteLine("CINT OK") delta = Convert.ToInt32(alpha And UInteger.MaxValue) Console.WriteLine("Convert.ToInt32 OK") Catch ex As Exception Console.WriteLine(ex.GetType().ToString()) Finally Console.ReadLine() End Try End Sub End Module On my 32-bit setups (Windows XP SP3 32-bit and Windows 7 32-bit) it prints "CINT OK", but in the 64-bit computer (Windows 7 64-bit) that I've tested THE SAME executable it prints the exception name only. Is this behavior documented? I tried to find a reference but failed miserably. For reference I leave the MSIL code too: .method public static void Main() cil managed { .entrypoint .custom instance void [mscorlib]System.STAThreadAttribute::.ctor() = ( 01 00 00 00 ) // Code size 88 (0x58) .maxstack 2 .locals init ([0] int64 alpha, [1] int32 delta, [2] class [mscorlib]System.Exception ex) IL_0000: nop IL_0001: ldc.i4.m1 IL_0002: conv.i8 IL_0003: stloc.0 IL_0004: nop .try { .try { IL_0005: ldloc.0 IL_0006: ldc.i4.m1 IL_0007: conv.u8 IL_0008: and IL_0009: conv.ovf.i4 IL_000a: stloc.1 IL_000b: ldstr "CINT OK" IL_0010: call void [mscorlib]System.Console::WriteLine(string) IL_0015: nop IL_0016: ldloc.0 IL_0017: ldc.i4.m1 IL_0018: conv.u8 IL_0019: and IL_001a: call int32 [mscorlib]System.Convert::ToInt32(int64) IL_001f: stloc.1 IL_0020: ldstr "Convert.ToInt32 OK" IL_0025: call void [mscorlib]System.Console::WriteLine(string) IL_002a: nop IL_002b: leave.s IL_0055 } // end .try catch [mscorlib]System.Exception { IL_002d: dup IL_002e: call void [Microsoft.VisualBasic]Microsoft.VisualBasic.CompilerServices.ProjectData::SetProjectError(class [mscorlib]System.Exception) IL_0033: stloc.2 IL_0034: nop IL_0035: ldloc.2 IL_0036: callvirt instance class [mscorlib]System.Type [mscorlib]System.Exception::GetType() IL_003b: callvirt instance string [mscorlib]System.Type::ToString() IL_0040: call void [mscorlib]System.Console::WriteLine(string) IL_0045: nop IL_0046: call void [Microsoft.VisualBasic]Microsoft.VisualBasic.CompilerServices.ProjectData::ClearProjectError() IL_004b: leave.s IL_0055 } // end handler } // end .try finally { IL_004d: nop IL_004e: call string [mscorlib]System.Console::ReadLine() IL_0053: pop IL_0054: endfinally } // end handler IL_0055: nop IL_0056: nop IL_0057: ret } // end of method Module1::Main I suspect that the instruction that is behaving differently is either conv.ovf.i4 or the ldc.i4.m1/conv.u8 pair. If you know what is going on here please let me know Thanks

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  • Flash+PHP+cookie

    - by naveen
    I want an animation play only once in the browser. If any user seen the movie and if goes to any other page or refresh(F5) and then come back on the animation page then animation should not play from start. I want to play it from another frame. I think it can be done by set cookie or somthing using javascript or php. Please anybody help me. Thanks in advance. I will appreciate ,if some code help please

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  • GNU Emacs is crashing with -nw

    - by Jack
    When I run emacs with -nw option, the emacs really open, but I can't do more nothing. As if the user input is blocked and no keyboard signal is received and/or interpreted. I've tried run without load .emacs file and some other behaviors: emacs -nw -Q --no-desktop --debug-ini foo.c But makes no difference and strangely the GUI-version(using Gtk) is working fine. My gnu-emacs version is GNU Emacs 23.3.1 Any help to help to fix it is very appreciated.

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  • Add different themes to the android application

    - by mudit
    hi all. i want to add themes to my android application. In the application, user will have options to changes theme of the application. Just like OIShopping List appplication. Please help how do i implement this kind of structure to my application. Any help, tutorials, guidance are highly appreciated. thanks..

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  • MySQL problem reconnecting (mysqld.exe) keeps giving error...

    - by Ronedog
    Need some guidance figuring out what went wrong. I've been using mysql, phpmyadmin for just under a year on my home computer while I develop a webapp. 3 days ago I updated my windows vista with all the "wonderful" microsoft updates, security patches, etc...and now it's broke. I tried uninstalling all the upgrades, but there are 4 of them I can't unistall because microsoft says their "operating system" updates and can't be unistalled. My system is: windows vista, php 5+, mysql 5.1, Apache 2+. I can run my web app and it queries the database without any problems. However, when I run phpmyadmin to get into the database I get an error: "mysqld.exe has stopped working" and phpmyadmin crashes. I tried going to the command line for mysql to do a mysqldump to backup my database and it gives me an error "2013, could not connect to the server". If I restart the computer the webapp will work again. Basically, php can query the database, but if I try to get at the database through phpmyadmin, or the command prompt the mysqld.exe error occurs and blows mysql out. Any ideas what's going on here? Any ideas how to get around this to backup the db, so I can reinstall mysql?. I'm really lost where to start. I don't really know if the updates caused the problem, or if the 4 updates that can't be unistalled are really the problem. Any tips will be appreciated. thanks.

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  • Group properties in custom control

    - by Gunners98
    I want to do a class that have properties like font, which will have other properties, such as name, size, unit,bold.I had tried a solution but it isn't working for me.(http://stackoverflow.com/questions/755391/group-properties-in-a-custom-control) Anyone can help? Any help will be appreciated. <TypeConverter(GetType(ExpandableObjectConverter))> _ Class TestingClass 'Some property here End Class

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  • Python regular expression

    - by user3692739
    I have this HTTP Request and I want to display only the Authorization section (base64 Value) : any help ? This Request is stored on a variable called hreq I have tried this : reg = re.search(r"Authorization:\sBasic\s(.*)\r", hreq) print reg.group() but doesn't work Here is the request : HTTP Request: Path: /dynaform/custom.js Http-Version: HTTP/1.1 Host: 192.168.1.254 Accept-Language: en-US,en;q=0.5 Accept-Encoding: gzip, deflate Referer: http://domain.com/userRpm/StatusRpm.htm Authorization: Basic YWhtEWa6MDfGcmVlc3R6bGH I want to display the value YWhtEWa6MDfGcmVlc3R6bGH Please I need your help thanks in advance experts

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  • summer training

    - by rohit-garg
    hi i wanna make a retail store software for my family retail store .... can anyone help me out with which language to use and just give me some basic ideas I'm an engineering student and have good knowledge of ASP, HTML, CSS, VBSCRIPT and have gone through java , c ,c++. please help me anyone

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