[Coco] USB cable powered CoCo 3 ???

[Tim Fadden]

Interesting.

The USB port is designed to supply power to external devices/ usb hard 
drives etc. There is a maximum current allowed through the port. Some of 
the usb drive cables I have  are arranged with two usb dongles on one 
end, and one on the other.  The single end goes to the device (coco) on 
the other end one cable has data and power connections, and the other 
has power only.  This is to double the current available to the 
device.   If you doubled up to connection to the PC with your setup, you 
might get a brighter screen. :-)


On 5/26/2010 10:09 AM, Roger Taylor wrote:
> At 12:00 PM 5/26/2010, you wrote:
>
>
>
>
>> For your circuit, add a power schotky to the 5 volt line so external usb
>> power cannot feed back and do that, it is considered a very dangerous 
>> thing
>> to allow.
>
> It was only a temporary connection.  That pin isn't even connected now.
>
> But it was cool watching the PC power the CoCo to some degree.  Now if 
> the CoCo power is unplugged and the PC's power is safe for the CoCo 
> then there's something there for a rainy day project.
>