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Unknown device on some computers

 
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Oncle Dave



Joined: 13 Aug 2007
Posts: 1

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Unknown device on some computers
PostPosted: Mon Aug 13, 2007 4:32 am     Reply with quote
Hi,

I have made a keyboard with a PIC18F4550.
It works fine on some computers but not on some laptops, even with a powered usb hub.
The Vusb seems correct (with oscilloscope) but there seems to be no data transfers.
I have no more ideas why this happens. Any idea ???

Thanks for the help.

Dave
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