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I built a multi tasking kernel for the 6809, which was an extended version of the 6800 rather than the 68000 series, which is quite a different kind of a CPU. I

I built a multi tasking kernel for the 6809, which was an extended version of the 6800 rather than the 68000 series, which is quite a different kind of a CPU. It was fun! Also created a double sided PCB using laser printers and then ironing the layout onto photo etching PCBs.

anonymousiam 4y ago
There was also OS9 (Microware, not Apple). It was very Unix-like, but not fully POSIX, and very poorly documented. After initial development on the 6809, they released a port for 68K. https://en.wikipedia.org/wiki/OS-9 https://en.wikipedia.org/wiki/OS-9