1. 
   XMK
   [operating system] The eXtreme Minimal Kernel (XMK) is a real-time operating system (RTOS) that is designed for minimal RAM/ROM use. It achieves this goal, though it is almost entirely written in the C programming language. As a consequence it can be easily ported to any 8-, 16-, or 32-bit m...
   Found op http://en.wikipedia.org/wiki/XMK_(operating_system)
   
   

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