[Coco] [Color Computer] USB project

[James Diffendaffer]

I've been looking at the cocoio.txt file that shows what device is
addressed where in the CoCo to see where I should address the USB
interface but it doesn't appear to list any of Cloud-9's stuff.

>From this list it appears that FF70-FF79 is mostly alternate
addresses, speech boards and other rare hardware.
It also appears that FF80-FF8F is more of the same.
Which of these is safest to use?

FF7x is nice because it only requires one inverted line for the
address testing.  I already need a part do do that since I have to
invert the R/W line to separate it into separate Read / Write lines
and invert the output of the nand gate I'm testing the address with. 
If I go with FF8x I need an additional part.  The part is cheap but it
takes board space, drill holes and more wires.





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