Special purpose system

Definition
A special purpose system is a

"[s]ystem or platform that employs computing resources (i.e., hardware, firmware, and optionally software) that are physically embedded in, dedicated to, or necessary in real time for the performance of the system's mission. These computer resources are referred to as platform IT. Platform IT only performs (i.e., is dedicated to) the information processing assigned to it by its hosting special purpose system."

Overview
"Examples of special purpose systems include weapons systems, training simulators, diagnostic test and maintenance equipment, calibration equipment, equipment used in the research and development of weapons systems, medical technologies, transport vehicles, buildings, and utility distribution systems, such as water and electric."