Title: Note to self: read descriptions very carefully.
Review: I bought this planning to use my old ergo keyboard and trackball (PS2) with my new computer that didn't come with PS2 ports. Turns out it has USB 2.0; this adapter may work on USB 1.0 or 1.1, but it DOESN'T work with USB 2.0. Live and learn. Other adapters' descriptions clearly state USB 2.0, and are much more expensive. My mistake. However, price was right.
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