一个简单的可以用在弹片击上的微操作系统，占用内存小，可移植性强

一个占用内存极少的菜单系统的实现，可在嵌入式系统中移植，有windows仿真-One take up memory very little achieve the menu system, can be in embedded systems transplantation, have windows emulation

LPC2138下加密/解密算法,完整MDK工程文件,测试通过,也可方便移植到其他平台.A5加密算法速度非常快.占用内存非常少,只需几十个字节就能工作,可用于流加密.-LPC2138 under the encryption/decryption algorithms, complete MDK project file, the test can also be easily ported to other platforms. A5 encryption algorithm is very f