isn't powering from the docking connector pins going to mean the serial port is 4800 baud? I know you can change it, but won't if affect people using the serial port in car?

Couldn't you use 1 of the pins on the serial port to control if the fan is on or off? DTR or such like?
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Andy MK2a 60GB Amber 040103916 32mb/Light Kit MK2a 50GB Amber 030102560 32mb