Construction of Assembly Language Three-tier Experimental System Based on EMU8086

8086 instruction system and assembly language is an important part of Microcomputer Principle course, which plays a connecting role in the whole course. For a long time, the experiment of instruction and assembly part adopts DEBUG and other experimental environment, and the operation interface is not friendly enough, so it can not be effectively connected with the later interface experiment. Based on this, the experimental platform of EMU8086 is introduced into the experimental part, the experimental system is constructed by dividing the contents of confirmatory experiment, exploratory experiment and design experiment, and the relevant experimental contents are designed. Students' innovation ability and development thinking have been improved from simple verification and imitation to exploration and truthseeking.