keil a51的一些网上收索的文档，很难集全的，对A51文件有一定的了解哦-Some on-line revenue keil a51 document claims it is difficult to set the whole, and on the A51 documents have a certain understanding of Oh! ! ! !

A51 Ax51 宏汇编器 及 相关应用程序-a51 Macro assembler and related applications