Commonly called the 101-Key Enhanced Keyboard these days, any keyboard that uses a 5-pin DIN legacy connector is referred to as an AT-Keyboard. It originally had 84 keys which were later increased to 101 which did not include the Windows Key now commonly found on the IBM compatible keyboards. It succeeded the 83 Key XT keyboards and used a different communication protocol and scancodes. It has now been replaced by PS/2 and USB keyboards.
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