Hello,
I am having a few users beta test my new high speed bus-powered USB
device intended to run only on the mac. During testing one user has
found that the device fails when he attempts to run the device on
his brand new 15" powerbook on battery power. He can literally have
the device functioning perfectly on DC power, and then pull the plug
and then it fails. What is confusing is that I've done all the
development for this device on a new 1.67Ghz 17" Powerbook, and on
the 17" it works fine, with or without DC power. I can unplug the
power while the device is running and I don't have any trouble at
all.
Is there any difference between the supplied power on the USB ports
of the powerbooks while on battery power? I thought they where all
rated up to 500ma and nothing should change when on battery power.
He has the same problem if he connects the device while the computer
is already on battery power.
I'm in the process of having him do more tests to find out exactly
how it fails, but i figured someone here might be able to help if
this is a hardware spec issue.
Thanks,
Juan
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