Abstract: A practical method of inserting waiting state in Single-Component Microcomputer (SCM) and a 8031 SCM development system composed of dualport RAM are provided in this paper. It is a parallel dual processor system consisting of a master, a dual-port RAM board and a SCM emulator. The master can monitor SCM so that the breakpoint function of software is achieved easily. The system is a cheap ICE, so it can develop other microprocessor by replacing the emulator.

Key words: Microprocessor, Dual-port RAM, Single-component microcomputer