说明：  计算机组成原理课程设计-模型机-加减法指令的实现.通过使用软件HKCPT，了解程序编译，加载的过程。通过微单步，单拍调试，理解模型机中的数据流向。
(Principles of Computer Organization curriculum design- model aircraft- add and subtract instructions to achieve. Through the use of software HKCPT, understand the procedure to compile, loading process. Through microcredit single-step, single-shot debugging, understanding the data in the machine model the flow.)