C51最常用的IDE环境，KEIL C51的最新版本Keil C51 V8.15。包含官方程序安装包和最新的注册机，已经修正了0xfd的bug，测试有效，笔者现在用的就是这个注册机破解版本。,C51 the most commonly used IDE environment, KEIL C51 latest version of Keil C51 V8.15. Installation package contains the official procedures and the lates