Simulation system and method for microcomputer program

A system for simulating a program for a computer, comprising:

• a machine language instruction execution simulation means for sequentially executing machine language level instructions of the program;
• a peripheral circuit simulation means for simulating a peripheral circuit of the computer;
• and
• a simulation control means for deriving a simulation period and notifying said peripheral circuit simulation means of the simulation period,
• wherein said peripheral circuit simulation means executes the peripheral circuit simulation for the simulation period so long as said peripheral circuit simulation does not influence the machine language instruction execution simulation, and
• wherein said simulation control means notifies said machine language instruction execution simulation means of the simulation period and said machine language instruction execution simulation means executes the machine language instruction execution simulation for the simulation period.