DOS7.1操作系统源码，很全，对大家编制其它一些应用软件很有参考价值。-DOS7.1-source operating system, is a long, we prepare for some other application software was useful.

Windows操作系统核心技术－讲义.zip-microsoft Windows kernel

S-DOS 7.10是目前功能最强大实用，且兼容性最好的DOS。而且由于它全面支持大硬盘、大内存、长文件名（LFN）、FAT32分区、可能直接启动Win3.x/9x等等，所以非常实用！-S-DOS 7.10 is the most powerful, useful, and the best compatibility with DOS. And because of its full support for large hard dr