IBM PC keyboard

Keyboards for the IBM PC are standardized. However during the 20 years of the PC architeture being constantly updated as well several types of keyboards have been developed. They all utilise the QWERTY layout.

• 83-Key PC/XT Keyboard Layout
• 84-Key AT Keyboard Layout
• 101-Key "Enhanced" Keyboard Layout (additional navigation and control keys)
• 102-Key "Enhanced" Keyboard Layouts (additional key to the left to the <enter> key)
• 104-Key "Windows" Keyboard Layout (Windows and menu key added)

There are three types of connectors used to connect the keyboards the main unit The first two are:

• 5-pin DIN (DIN 41524, "AT") connector
• 6-pin "mini-DIN" (DIN 45322, "PS/2") connector.