The Research Of Virtual Experiment Of Computer Interface

With the rapid development of computer network,there is a greate probability of the remote education via internet.Because virtual experiment is a key part of the remote education,many countries pay much study to the field. The technology of virtual experiment and the enlightenment of its application in remote education are also been briefly discussed.An initial work in the field of virtual experiment of computer interface has been done in this thesis. A programmable control model has been provided.By analysing the structure of practical computer interface experiment and the mechanism between user program and system hardware on MS-DOS and Windows 9X,we get a way which builds a software interface between user program and system hardware. Software interface can capture I/O and interrupt instruction,and send a virtual interrupt to virtual instrument.We define a abstract virtual model.By analyzing structure of 80386 and Windows 9X,we concrete the virtual model,build a virtual model on Windows 9X and analyse the mechanism.We discuss the technology of VxD,complete the function of software interface by VxD.We discuss the technology of DLL and building virtual instrument model,complete virtual driver by DLL and virtual stepmotor by forward modeling.As the result shows,the programmable control model can not only solve virtual experiment of computer interface,but also achieve better effect than practical experiment.The model provides a way to build other control virtual experiment.