If you want to do everything by USB, or if you are using some of the newest PCs available (that have no serial or PS2 ports), you can use a USB to serial converter for the data, and a USB to PS2 converter for the power (such as this one http://www.neworldit.com/ProductDetails.asp?ProductCode=13790345101). Just make sure that your computer has at least 2 unused USB ports. If you have 1 or 0 unused USB ports, you will need a powered USB port hub.
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