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The AT keyboard was a keyboard with 84 keys introduced with the IBM PC/AT computer. It succeeded the 83-key PC/XT keyboard
IBM PC keyboard

The IBM PC keyboard and its derivative computer keyboards are standardized. However, during the 20 years of the PC architecture being constantly updated, several types of keyboards have been developed....
 and therefore did not have many of the features seen on modern keyboards such as arrow keys and dual ctrl and alt
Alt key

The Alt key on a computer keyboard is used to change the function of other pressed keys. Thus, the Alt key is a modifier key, used in a similar fashion to the Shift key....
 keys. It was later replaced with the 101-key Enhanced keyboard
Enhanced keyboard

The enhanced keyboard is a type of computer keyboard first made by IBM which has 101 or 102 keys. The major difference between this and previous XT/AT keyboards is the twelve function keys arranged in a line across the top of the keyboard as opposed to ten grouped on the left hand side of the keyboard....
. Nonetheless, "AT keyboard" remains a popular name for any keyboard that uses the 5-pin DIN connector
DIN connector

A DIN connector is a connector that was originally standardized by the Deutsches Institut f?r Normung , the German national standards organization....
. This connector is often considered a Legacy port
Legacy port

A legacy port is a port or connector on a IBM PC clone that is considered fully or partially obsolete. Some manufacturers, particularly in laptops, remove the legacy ports, making way for modern ports such as Universal Serial Bus....
.






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The AT keyboard was a keyboard with 84 keys introduced with the IBM PC/AT computer. It succeeded the 83-key PC/XT keyboard
IBM PC keyboard

The IBM PC keyboard and its derivative computer keyboards are standardized. However, during the 20 years of the PC architecture being constantly updated, several types of keyboards have been developed....
 and therefore did not have many of the features seen on modern keyboards such as arrow keys and dual ctrl and alt
Alt key

The Alt key on a computer keyboard is used to change the function of other pressed keys. Thus, the Alt key is a modifier key, used in a similar fashion to the Shift key....
 keys. It was later replaced with the 101-key Enhanced keyboard
Enhanced keyboard

The enhanced keyboard is a type of computer keyboard first made by IBM which has 101 or 102 keys. The major difference between this and previous XT/AT keyboards is the twelve function keys arranged in a line across the top of the keyboard as opposed to ten grouped on the left hand side of the keyboard....
. Nonetheless, "AT keyboard" remains a popular name for any keyboard that uses the 5-pin DIN connector
DIN connector

A DIN connector is a connector that was originally standardized by the Deutsches Institut f?r Normung , the German national standards organization....
. This connector is often considered a Legacy port
Legacy port

A legacy port is a port or connector on a IBM PC clone that is considered fully or partially obsolete. Some manufacturers, particularly in laptops, remove the legacy ports, making way for modern ports such as Universal Serial Bus....
. Many Enhanced keyboards used this, though it was eventually superseded by the PS/2 connector
PS/2 connector

The PS/2 connector is used for connecting some Computer keyboard and computer mouse to a PC compatible computer system. Its name comes from the IBM Personal System/2 series of personal computers, with which it was introduced in 1987....
 and many modern computers use Universal Serial Bus
Universal Serial Bus

In information technology, Universal Serial Bus is a Serial communications computer bus standard to electrical connector devices to a host computer....
 (USB) connectors instead.

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