Main Page | See live article | Alphabetical index Keyboards for the IBM PC are standardized. However during the 20 years of the PC architecture 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 key) 104-Key "Windows" Keyboard Layout - Windows and menu key added 107-Key "Enhanced" Keyboard Layout - Wake, Sleep, and Power keys added (for power management) 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. They are physically different but electrically the same. The third is via a USB connector. See also: computer keyboard External Link Standard keyboard layouts This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.