用汇编语言，设计一个多重引导程序，安装在一个装有多个操作系统的硬盘里，在计算机启动的时候，能让用户选择要启动的系统。 这是学习汇编程序设计课程的实验，自己写的，用masm编译，在vmware虚拟机上测试通过。内附源码、可执行程序及实验报告。 该程序会改写MBR引导的部分，在真是机器上运行有风险。-This is multi-boot program. With MultiBoot installed in the hard drive installed several OS, user

开发os 的最开始部分加载kernel.bin文件。 从mbr到loader，loader再加载kernel入内存并运行-Os the beginning of the development of the most loaded kernel.bin file. From the mbr to the loader, loader and then load the kernel into memory and run

Example of turning on protected mode inside MBR code. The program reads and prints memory content at 0xBF7980C0. This task can t be done in 16-bit mode

Example of turning on 64-bit mode inside MBR code. The programs allows to access up to 16 exabyte from MBR code.

为自己的操作系统临时写的一个MBR，以及写入MBR的程序-Operating system for their own temporary write an MBR, and written to the MBR process