The rush to replace monolithic proprietary supermini-based training simulators with ones using distributed microprocessors under Unix is creating big problems for hardware suppliers and simulator builders alike, and Tinton Falls, New Jersey-based Concurrent Computer Corp wants to help the latter. It has unveiled announced SIM/Spectrum, a range of hardware and software products for simulation and training systems builders. It is said to enable developers to upgrade and modify existing simul ators and training systems, maintain concurrency between training simulators and actual devices and reduce life cycle costs. SIM/Spectrum comprises standards-based hardware, the SIM-7000 and SIM-8000 computers, Concurrent’s Real-Time Unix, Synthetic Period Scheduler, C3 Ada Language System, real-time computer aided software engineering tools and framework.