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Retrocomputing

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    The Dragon 32/64 also; almost exactly like the CoCo but I think because both are based on the support chips provided directly by Motorola (and, especially, the 6847) rather than because the one is based on the other. Commented Feb 18, 2018 at 23:02
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    "Couldn't run CP/M" was not helping. Commented Feb 19, 2018 at 0:57
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    It was used a lot. By french company Thomson, at least. They sold a lot of computers (MO5, TO7) all using the 6809. Thet were cheap, and found a way in a lot of homes and schools. Commented Feb 19, 2018 at 5:17
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    The following is not exactly an answer to your question, but might be of interest. There was a real-time multi-tasking operating system "OS-9" that started with a 6809 version (what gave it its name) and became quite successfull later when ported to the 68000 family. Personally, I only used OS-9/68000, so I have to guess a little what the predecessor looked like. OS-9 as a real-time OS needed low interrupt response times, so the 6809 probably was a good match. The OS made use of position-independent, reentrant code, by having the software organized in "modules" containing code and read-only da Commented Feb 19, 2018 at 9:50
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    It was used in a large number of industrial microcomputers and quite a few office micros. OS/9 was one of the best real-time OSs around at the time - and still in use. Commented Feb 19, 2018 at 10:01