计算机原理课程（微机原理）课程上用到得汇编源程序。包括8250编程，8259，8253，8255，ad0809,dac9021等硬件的汇编代码。相信对于学习这一块的人来说，这些文件内容一看就懂。-Computer Principles Course (Computer Principles) course on the compilation of source code must be used. Including the 8250 program, 8259,8253,8255, ad0809, dac9021 hardware such as assembly code. And I believe that people who learn this one, the contents of these documents to understand at a glance.