alan.b.pearce@stfc.ac.uk wrote:
>
>
> Most of the Dell power supplies have a dallas 1-wire device connected to
> the 3rd pin. This gives the laptop information about the capability of
> the attached power supply. See
> http://www.howtofixcomputers.com/forums/dell/dell-pa-10-ac-adapter-cente
> r-pin-108608.html for details, including the ROM contents of one version
> of the chip.
>   
Must be a very cheap chip :)

The three pin in a triangle layout on keyed square connector as used in 
early 2000s doesn't have any intelligence.

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