RS published a technical manual for the color
computer; I have a copy of i
somewhere. HOWEVER I found there's an app note from Motorola with schemati
that almost exactly match those in the RS technical manual. I don't recal
whether it was a 6809 app note or a 6847 app note though. If you can find
set of old Motorola data books you may be able to find it.
Since I have three distinctly different generation boards I suspect the moto
prints would hold to the oldest.