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Re: 6809 mill clone

For the memory mapping, the swtpc method you mention would be a good option. If you haven't seen it already, the www.swtpc.com web site has schematics of the MP-09 cpu board. If this scheme is used then perhaps the competitor operating system uniflex may be able to be ported over. This would be a big challenge, but the source is available for this, so who knows.

I had a look for the coco3 memory mapping scheme, its not something i've ever really looked into. Seems it uses 8k memory pages(instead of 4k for the swtpc), but has two tasks, so a similiar amount of memory would be required to implement it. 

One nice thing to have would be some sort of common ram access like the Mill. This may be difficult if running the 6809 at 2mhz. It may need some sort of speed control for memory access to specific addresses.

i'd also be interested one if it gets built.  

/Rob