Embedded Operating Systems, including: Plan 9 From Bell Labs, Real-time Operating System, Palm Os, Os-9, Qnx, Symbian Os, Freedos, Vxworks, Cisco Ios, ... Operating System Embedded, Ecos, Osek, Lejos

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More info: An embedded operating system is an operating system for embedded computer systems. These operating systems are designed to be very compact and efficient, forsaking many functions that non-embedded computer operating systems provide, and which may not be used by the specialized applications they run. They are frequently also real-time operating systems.