[Coco] [Color Computer] Re: USB project

[James Diffendaffer]

So far I've found Cloud-9 uses:

FF74-FF75 is for their SCSI
FF78,FF79 and FF7C for the real time clock
FF50-FF59 is default for the IDE

FF70-FF73 and FF76-FF77 isn't a lot of room.

--- In ColorComputer at yahoogroups.com, "James Diffendaffer"
<jdiffendaffer at y...> wrote:
> 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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