-----Original Message----- From: G-List [mailto:[EMAIL PROTECTED] On Behalf Of James Fraser Sent: Tuesday, October 12, 2004 05:08 To: G-List Subject: Re: Overloading ADB Port on B&W
And: how much power does a USB port generate compared to an ADB? IIRC,ADB>expect enough power to be there...ports can control up to 7 devices and USB can control up to 127. Of course, this may not mean you can hook up 127 noodle cookers and still
USB supports 127 addressable devices but power is another matter entirely. IIRC, ADB supplies a maximum of 200 mA (.2 A) to all devices. The limit of 7 devices is somewhat arbitrary.
I am pretty sure each USB port is only designed to provide power to 1 device. So if you have a bus-powered USB hub, you can't use a device that runs on bus power to that.
Each USB port is able to provide a maximum of .5 Amps at 5 Volts or 2.5Watts. That's the maximum. If you are using a bus powered hub then the hub and everything connected to it is limited to a total of .5A. Connecting a externally powered USB hub doesn't count to this .5A as the external power supply provides power for the hub and devices plugged into it.
--
Clark Martin
Redwood City, CA, USA
Macintosh / Internet Consulting
"I'm a designated driver on the Information Super Highway"
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