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I have a dell d630 laptop and I recently bought a Microsoft Natural Multimedia Keyboard 1.0a. When I looked over my computer for a place to plug the cord in, however, I couldn't find one. The end of the cord has a circle of dots with a small plastic rectangle in the middle. Do most computers have a place to put this kind of cord, or is it outdated or something? Is there anything I can do to get the keyboard to work? Is there some kind of cord I can buy to make this work with a USB port?

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now i feel old :( –  Sirex Dec 3 '12 at 23:38

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That type of cord is called a PS/2 cord and yes, it has been superseded by USB.
You can find an adapter at any electronics store, or online. (You're looking for a "PS/2 to USB adapter")

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Sounds like a PS/2 connector. PS/2-keyboards are not outdated, as they are still widely used for their performance benefits, e.g. full n-key rollover, but have been superseded by USB as a de facto standard, largely in favour of compatibility. Compatibility is still good enough that 'dumb' PS/2-USB-adapters for keyboards almost always work for keyboards and mice. PS/2-USB-adapter

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Almost always. This only works if the keyboard 'speaks' both USB and PS/2 and it auto detects when you use such a plug. What you really want is an active converter, or a Lattitude D series dockingstation. –  Hennes Dec 3 '12 at 23:47
    
Have had issues with some adapters not working in the past. Microsoft used to ship an adapter with Keyboards and mice. Third party ones were hit and miss –  Dave M Dec 3 '12 at 23:54

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