IT 元素

实模式到保护模式到切换

Hector — Tue, 27 Jul 2010 13:48:10 +0800

一、实模式寻址

段首地址×16＋偏移量＝物理地址为什么要×16？因为在8086CPU中，地址线是20位，但寄存器是16位的，最高寻址64KB，它无法寻址到1M内存。于是，Intel设计了这种寻址方式，先缩小4位成16位放入到段寄存器，用到时候，再将其扩大到20位，这也造成了段的首地址必须是16的倍数的限制。

二、保护模式寻址

保护模式下分段机制是利用一个称作段选择符的偏移量，从而到描述符表找到需要的段描述符，而这个段描述符中就存放着真正的段的物理首地址，再加上偏移量。公式：xxxx:yyyyyyyy

其中，xxxx也就是索引，yyyyyyyy是偏移量（因为32位寄存器，所以8个16进制）xxxx存放在段寄存器中。

简单到引导扇区汇编代码解释

Hector — Sun, 25 Jul 2010 09:55:41 +0800

这个代码段是存于磁盘引导扇区的系统引导（自举）程序。若存于硬盘第一个扇区，则这段代码称为：硬盘主引导记录；若存于硬盘某个分区的第一个扇区，则称为：分区引导记录；若存于软盘的第一个扇区，则称为：软盘引导记录。称为磁盘引导记录的重要标志是： Related posts:

ubuntu10.04安装JDK和JRE

Hector — Sat, 24 Jul 2010 18:12:16 +0800

解决办法（选择一个即可）： 1、系统->系统管理->软件源->“其它软件”下添加一个 deb http://archive.canonical.com/ lucid partner 之后，再执行apt-get install 2、自己从sun网站下载相应的Jre,JDK安装即可 3、从新立德软件管理器中search openJDK,用openJDK代替 Related posts:

How to sell products to foreigners in China online

Hector — Mon, 19 Jul 2010 01:21:50 +0800

If you've been thinking about opening an online store, you're definitely onto something. Industry experts are projecting ecommerce revenue to grow a whopping 12% compared to last year. Better yet, things aren't expected to slow down anytime soon. By 2014, US ecommerce sales are projected to increase another 66%, reaching an astounding $223.9 billion. Chinese products are cheap, and sell them overseas will have great profits. Before starting the online business of your dreams, take a look at the following things you'll need to know before launch. Keep in mind that you won't need to do everything all at once, but in order to succeed online, you should definitely think about how to fit them into your strategy.

1. Figure out what to sell online

Whatever the case, the first step in successfully selling online is to decide what you'll be offering for sale.

2.Decide which ecommerce solution is best

装Daemon Tools反复重启

Hector — Fri, 16 Jul 2010 21:30:16 +0800

一、症状

在点击安装程序的时候，无论重启多少次都提示“You must reboot after previous operation”导致无法安装。装完又重启，重启又安装，如此反复，就是无法到下一步。

二、安装错误导致的无法安装

此时，只需要将注册表的值删除即可。进入注册表(运行regedit)，展开到如下：HKEY_LOCAL_MACHINE\Software\19659239224e364682fa4b af72c53ea4 或者HKEY_LOCAL_MACHINE\Software\14919ea49a8f3b4aa3cf10 58d9a64cec，找到任意一个就可以将其整个项都从注册表删除。然后再运行DT的安装程序，这个提示就不会再出现，可以正确安装

三、sptd驱动问题

1、删除注册表的键值，和上步一样。 Related posts:

Social Radio Network

Hector — Thu, 15 Jul 2010 17:46:47 +0800

1.About social radio network

social networking represents a large opportunity for terrestrial radio stations to gain relevance and currency online. Someone suggests two ways in which social networking could enhance traditional radio:

Enable people to connect with others and show that they belong to a certain tribe represented by the music and bands they follow.
Help listeners discover new music (a function where music-based social networks, such as Last.fm, have shown the way).

2. BlogTalkRadio ---A examples

BlogTalkRadio is the social Internet Radio network that allows users to connect quickly and directly with their audience. Using an ordinary Related posts:

Innovative Computer

Hector — Thu, 15 Jul 2010 15:50:16 +0800

Innovative computer solutions’ Products include mini and ruggedized form factors, all-in-one PC's, touchscreen interfaces, email archival and network security appliances. they are engineered specifically for healthcare, education, industrial, military and commercial applications not served by traditional PCs. There are some examples as follows.

Medical Computer

Medical facility equipped with a large number of medical and computer, according to different functions, there are many different types of medical computer . Sucn as Medical PC, Medical Grade PC, Medical Computer,Medical Grade Computer,Hospital PC, Hospital Computers, Computers Hospital, Medical IT, Computer EN60601-1, Operating Room Computer, Computer Operating Room, Intensive Care Computer, Computer Intensive Care, Operating Theater Computer, Computer Operating Theater, PACS Computer, Electronic Patient Record Computer, Computer Electronic Patient Record, Radiology Computer and Computer Radiology Related posts:

C#中Cookie乱码

Hector — Wed, 14 Jul 2010 22:02:26 +0800

写COOKIE:

HttpCookie acookie = New HttpCookie(user); acookie.Values.Add("user", HttpUtility.UrlEncode(user)); '写COOKIE时进行编码 acookie.Values.Add("pass", HttpUtility.UrlEncode(pass)); Response.Cookie(acookie);

读COOKIE:

HttpCookie acookie = Request.Cookies(user); Session["user"] = HttpUtility.UrlDecode(acookie.Values["user"].ToString()); Session["pass"] = HttpUtility.UrlDecode(acookie.Values["pass"].ToSring()) ; '读COOKIE时进行解码 Related posts:

linux文件夹同步

Hector — Sat, 10 Jul 2010 00:52:50 +0800

同步文件夹

在移动硬盘与硬盘之间、本地与网络（FTP，SSH等）之间备份数据、同步文件夹的需求对于Linux用户是很常见的。在Windows中，有Total Commander等工具同步文件夹的功能很强大，那么Linux中有哪些同步文件夹的软件呢？

rsync和grsync

rsync是Linux中重要的文件同步工具，支持本地和远程的文件同步工具，而grsync则是它的图形界面。 Related posts:

SQL2005出现sql.cab找不到

Hector — Sun, 04 Jul 2010 16:21:22 +0800

安装所需的 CAB 文件‘Sql.cab’ 已损坏，不能使用。这可能表示网络错误、读光盘错误或此软件包错误。网上说法一大堆，真没有发现哪个能解决问题的。 Related posts: