refer this for more info on USB: http://www.accesscomms.com.au/Reference/USB.htm
http://www.commsdesign.com/printable...cleID=16500233

I do not have an N800 myself. just interested:
I think it is necessary to inject power to the usb cable besides modifying connector, because the current is 100ma, too weak to power a peripheral. i think the +5V line in N800 end should be cut to prevent the power being injected into N800.

if the peripheral does not have ID line, a powered usb HUB with "A" type ports can be used to power peripheral.

just one question: what will happen if the n800 is set to HOST mode when connecting it to a computer, which require n800 as slave? i do not think the mode is changed automatically.

do not believe me if you do not understand what i mean or you think i am wrong.