INPUT/OUTPUT SIMULATION SYSTEM

PURPOSE:To efficiently develop a program for executing the physical input and output, by executing a debugging work in a state that no physical environment exists by executing a simulation of the physical input/output operation. CONSTITUTION:A physical input/output executing program 1 is converted to a program 3 for executing the pseudo physical input/output by a code converting program 2, and a physical input/output executing instruction is converted to a call routine of a physical input/output simulation mechanism 4. The pseudo physical input/output executing program under the simulation environment calls the physical input/output simulation mechanism 4 at every input/output instruction. The physical simulation mechanism 4 fetches necessary information from an actual machine environment description file 5 in accordance with input/ output information, etc. and executes a simulation of an actual machine. In such a way, as for the debug of the program for executing the physical input/ output, the debug of a high level can be executed under a logical debug environment without using the actual machine, and the productivity of the program for executing the physical input/output can be improved.