很老的东西，1993年左右的书，书的作者吕晓庆,通过一个将DOS POST到保护模式的开发环境,对了解保护模式有点参考价值,个人感觉这本



书里边的东西学起来比较顺手.直道现在也几乎没有见到像这本书这样介绍保护模式系统的书.



这本书上的代码有点错误.运行不起来.1998年左右我修改了下,可以用了.可以用这个代码来实作,段,页,多任务,模式切换.CPU异常等处理.



而且里边还带个最简单崩溃的调试器的代码，出现异常时候可以将当前的i386 寄存器给打印出来,



目录中的v86dos里边是v86DOS 玩具操作系统的代码,它将DOS 自举到虚拟86模式,并在之前初始化相关IA32保护模式资源.提供中断调用门,进入保护模式.



目录中的v86base 中是一些玩保护模式下功能调用V86DOS 玩具操作系统调用门的小代码.比如页错换页测试,双任务测试(一个在屏幕上



边打+,一个在屏幕下边打-),这个在DOS 时代确实还比较新鲜.估计这玩艺对了解保护模式可能有点意义,放在硬盘中



差点就把这个东西丢了,嘿嘿,现在放上来共享之.-Very old stuff , about 1993 books , author of the book Lv Xiaoqing , by a will to protected mode DOS POST development environment for understanding a bit protected mode reference value, this personal feeling



Inside the book to learn something more smoothly . Straights are almost not seen this book describes the book as protected mode system.



This book is a bit of code on error . Running up around .1998 I modified the next, can be used can be used to implement this code , section , page , multi-tasking, mode switching . CPU abnormal processing .



And inside also with the most simple code debugger crashes , abnormal when the current i386 can register to print out,



Directory v86dos is v86DOS toys inside the operating system code, it will bootstrap to a virtual 86 DOS mode and protected mode before initializing IA32-related resources . Provide an interrupt call gate , into protected mode.



Directory v86base is some play toys protected mode operating system function calls V86DO