C#控制textbox文本框仅能输入数字类型

从表面上看，保护模式和实模式并没有太大的区别，二者都使用了内存段、中断和设备驱动来处理硬件，但二者有很多不同之处。我们知道，在实模式中内存被划分成段，每个段的大小为64KB，而这样的段地址可以用16位来表示。内存段的处理是通过和段寄存器相关联的内部机制来处理的，这些段寄存器（CS、DS、 SS和ES）的内容形成了物理地址的一部分。具体来说，最终的物理地址是由16位的段地址和16位的段内偏移地址组成的。用公式表示为：物理地址=左移4位的段地址+偏移地址。-On the surface, protected mode and real mode is not much difference between the two are the use of the memory, Drivers interruption and equipment to deal with the hardware, but there are many differences. We know that in real mode which has been divided into memory, each the size of 64 KB. and the addresses of 16 can be used to express. Memory of the handling of the adoption and register linked to the internal mechanisms to deal with, of these registers (CS, DS, SS and ES) with the formation of a part of the physical address. Specifically, the ultimate physical address is 16 of the 16 addresses and the addresses of migration within the composition. The use of the formula is expressed as : physical address = 4 bits of the address offset address.

此源码是传统的飞机游戏,在游戏的过程中背景图不断的变化,挺不错的,先玩玩,在看代码-this source is the traditional game of the aircraft, in the course of the game background map the changing sounds very good first play, in view code

信号转换可以讲非方波信号转换为方波 很好用的啊可以测频率-swif

Java EJB方面的实例集，学习EJB的新手朋友，可不要错过这个实例集，里面涉及了很多EJB方面的基础知识和操作技巧。

PCL的一个原代码,工业控制和数据处理,自控方面的一个小东东.-PCL one of the original code, industrial control and data processing, control of a small Eastern.

charecter recognition

这是用java编写的一个简单的计算器的源码以及编译后生成的文件-This is a java prepared by the simple calculator and the compiled source files created in the

用ＭＡＴＬＡＢ实现ＬＭ算法库，使用时添加其为工作目录，便可使用各种函数．-LM algorithm using MATLAB realize the Treasury, when used to add its working directory, you can use a variety of functions.

使用vhdl编写的一段程序。 主要功能是声音周期计算，以区别声音信号与噪音信号。-vhdl prepared by the use of a procedure. Its main function is voice cycle, in order to distinguish voice signal and the noise signal.

学习LPC2468或者lpc2478的好东西，是了解芯片的基础书籍，要好好看啊！-Learning LPC2468 or lpc2478 good thing is to understand the basis of chips books, better look good ah!