A New Approach
This is a combined HW/SW approach. The host is responsible of having OS, some applications and might have superset simulating environment (RSIM, SIMICS, SIMOID).
Use of fast backplane (PCI) for communication. Real processor or processor core in FPGA as hardware model, and ASIC/FPGA for interface and interconnection for hardware modeler.
Good for fast complex architecture simulations including multiprocessor.