The technology of developing selector——the frontier of teaching evaluating system

This paper discusses the technology of developing selector's hardware software the frontier of teaching evaluating system.The selector is made of clients,master and computer.The master communicates with all clients with serial bus.It reads the data in clients and stores them in its RAM.The master is connected with ISA bus of computer,and sends the data of RAM to computer.Then computer transacts data by VC++.Finally,the information is imaged by words、graphics and sound.The selector is mostly applied in high school classes,entertainment,voting and election for the functions of choice and preemption.