Abstract: A method for performing diagnostics on a CPU logic simulator executes certain portions of the diagnostics on a real-machine, and other portions in the software simulator. Those portions that must be executed in the simulator are executed on the simulator, while those portions that need not be executed on the simulator are preferably executed on the real-machine. The method coordinates the execution of the diagnostic functions between the real- machine and the simulator to achieve improved speed of diagnostic execution.

Abstract: Software simulation of a multiple CPU computer system design utilizes integer type program statements having program variables typed as integer that correspond to the boolean input variables of the design equations. Each of the program variables is assigned to a digital word having at least as many bits as the number of CPUs, with the boolean value of variables for each CPU represented by one of the bits in the word as a binary one or zero. The program statements are executed on a computer and evaluated to provide a result word wherein the individual bits of the result word represent the logic output state of the boolean equation for each CPU.