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I know they use a flat cable to connecto to the motherboard, but logically, are they USB or PS2 devices?

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In my laptop, specifically, it is PS2. But is this true for all/most laptops? – Vam'çá Nov 8 '10 at 15:50
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I would guess modern laptops probably connect them through the USB bus, although i don't know with any certainty.
You should be able to check on yours if you open Device Manager and under View on the menu select Devices by connection. then it is just a matter of clicking through the connections until you find it.

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Depends on the laptop, but yes, the hardware inspection tool on your operating system should be able to tell you.

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