Θ Computers: Software: Operating_Systems: Realtime: MicroC-OS

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Micrium, Inc. Makes µC/OS, µC/OS-II (MicroC/OS, MicroC/OS-II), full source code, no royalty, free non-commercial use; other software for embedded use: Embedded Systems Building Blocks, µC/GUI for most 8- to 64-bit processors, µC/FS FAT filesystem.
Simulation of uC/OS-II on Win32 Platform Environment for uC/OS-II RTOS on Windows 32-bit platform; has 2 main modules, run as normal programs: module 1 (WCOS) runs RTOS with embedded program, module 2 (WSim) has functions to run and control full simulation with any hardware platform.
MicroC/OS-II Growing article, with links to many related topics. Wikipedia.
Application Note µC/OS-II and Turbo C++ 1.01 Describes port of µC/OS-II to x86 CPU, via Borland compiler. Quantum Leaps, LLC.
Micrium µC/OS-II: The Real-Time Kernel Description, information, downloads, support. DeviceTools.
MicroC/OS-II: The Real Time Kernel By Jean J. Labrosse; Elsevier Newnes, 2002, ISBN 9781578201037. Describes design, implementation of RTOS; reference to kernel, and detailed and readable design study for embedded system students.