Abstract: This paper presents an inlerruptive keyboard terminal applicable to a Z-80 microcomputer System. The design principle and structure of the keyboard hardware are discussed. The main functions of the interruptive routine, the arrangement and block diagram of the program design are given. If a microcomputer with RTOS is equipped with a keyboard torminal of this kind, it will enable the system to have the ability for real - time man-machine interaction and result in greater handiness for process control.