DSPnano RTOS and Unision RTOS are Linux or POSIX compatible real-time operating systems specifically geared for DSP applications (i.e., applications that process data on a continuous basis in real-time as it flows to and from external devices.) The DSPnano RTOS is tiny and runs on many 16-bit microcontrollers, DSPs (digital signal processors) and DSCs (digital signal controllers). Unision DSP RTOS is more general; it is suitable for embedded processors that have 32-bit buses.