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AT keyboard connector - technical definition
Refers to the 5-pin DIN connector used on earlier PC keyboards. It was subsequently replaced with the smaller 6-pin MiniDIN connector, which is known as a "PS/2 connector" and which was first used on laptops.
AT and PS/2 Connectors
Adapters switch between AT and PS/2 connectors so that the newer keyboard can work with an old PC or an old keyboard can work with a newer PC.
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