The AT keyboard was a keyboard with 84 keys introduced with the IBM PC/AT computer. It succeeded the 83-key PC/XT keyboard and therefore did not have many of the features seen on modern keyboards such as inverted-T arrow keys and dual ctrl and alt keys. It was later replaced with the 101-key Enhanced keyboard. Nonetheless, "AT keyboard" remains a popular name for any keyboard that uses the five-pin DIN connector. This connector is often considered a Legacy port. Many Enhanced keyboards used this, though it was eventually superseded by the PS/2 connector, which is mechanically different but electrically and protocol-wise identical. Many modern computers use Universal Serial Bus (USB) connectors instead.

Compared to the 83-key XT keyboard, the AT keyboard uses a different communication protocol and a different set of scancodes. Despite having the same connector, the two are not interchangeable.

External links

• AT keyboard connector and pinout
• AT keyboard scancodes

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