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by jacquesm 2492 days ago
The 6809 is an amazing little processor, you can run multi-tasking and relocatable code on it with relative ease. And with some bank switching magic you can even do that with appreciable amounts of RAM for each task. It is also one of the few instruction sets that is very predictable, if you know some base formats then you can 'compose' instructions and they usually exist as a valid opcode.
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“UniFLEX is a Unix-like operating system ... for the Motorola 6809”:

https://en.m.wikipedia.org/wiki/UniFLEX