[Coco] 8-Bit Microcomputers

[Brad Grier]

A few questions...

Were there any other home computers based on the 6809 besides the CoCo? 
I know there were quite a few arcade games. Perhaps some failed platform 
or something used outside of the United States?

I've never used an Atari 400/800 or Commodore 64 in my life. How do 
these machines compare to the Coco? Specifically, I'm interested in the 
graphics capabilites and the processors. Which had the better games?

Thanks,

Brad