The Nucleus real-time operating system (RTOS) now targets Analog Devices' dual-core ADSP-BF561 Blackfin DSP. The POSIX-compatible RTOS is supported by the company's Nucleus EDGE (Embedded Developers Graphical Environment), which is based on the open-source Eclipse project. EDGE incorporates the company's debugger and profiler. The Nucleus RTOS pricing starts at $12,495. The RTOS is royalty-free.