Hi Mark
Not sure whether this has been answered but some USB devices need
external power (which I presume the scanner does). IIRC - I admit I'm
a bit hazy - keyboards don't provide much power. For example, my mouse
and Wacom bamboo graphics tablet work just fine connected to an Apple
keyboard which is connected to a USB port on a KVM unit I use with my
various macs. My work-issue Wacom Intuos 4M needs to be directly
connected to the KVM unit (which is also plugged into a wall socket).
When the Intuos is connected to the keyboard, the macs complain that
it's not getting enough power. I've never seen it cause the keyboard
to lock up though. I've also seen a USB exterrnal hard disk which
again needed an external power supply. That didn't stick around for
long - hooray for multi-gigabyte flash-drives!
Apologies if I'm just dribbling here - it's been a long day.
Bruce
On 2 Feb 2011, at 12:38, smac0031 wrote:
I am having strange USB goings on.
First the minor thing. I have an iMic plugged into the standard USB
port on my DA and a stereo. When I shut my stereo off my DA wakes up
out of sleep. I guess this probably has something to do with the DA
being wired to use a keyboard with a power key. This is no big deal.
I also have a Firewire 800/ USB 2.0 card with two ports of each type.
I have a USB 2.0 hub plugged into that. I have an Epson scanner that
isn't recognized unless it's plugged in directly to the other USB 2.0
port. I recently bought an Apple brand USB 2.0 keyboard which I
plugged into the hub. It works okay unless...
I plug my digital camera into either the USB hub or the second USB
port on the keyboard, then the cursor locks up. The keyboard might be
locked up, too, anyway, I have to restart when this happens.
The USB 2.0 is from Hong Kong out of eBay. I think I should have got a
USB 2.0 card with more ports on it.
Mark Murphy
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