I have a few of the things (and a whole pile of 68A09
CPUs which also
seem very hard to find data for).
I assume you realise that's just the 1.5MHz version of the 6809, so for
most things a 6809 data sheet is all you need (surely one of the CoCo
sites has that, or a pointer to it???)
I certainly have the 6809 data sheet on paper, whether I have the 6803
one is another matter.
-tony