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I wrote an cooperative multitasking RTOS for an ATMega processor in 1200 or so lines.

If you're willing to share the code, I'm sure many of us would love to see it.

Here you go!

Turned out it was a preemptive RTOS. I had forgotten that.

I wrote a preemptive multitasking one for an AVR in about the same amount of code :-)