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"Eraser Head" mouse interface IC?

Johnnyquest

Johnnyquest

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Does anyone know of any interface IC's or schematics for what some call an "eraser head"; pointing stick; IBM calls it a TrackPoint; that is used in laptops as a mouse in the keyboard?
 
The "nipple" controller is made by Philips. I don't remember the part-number. You should check out their web-site for datasheet.


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