XT layout
Provided by the ASK Keyboard Dictionary
The XT layout refers to the key arrangement of Model F-based IBM 5150/5160 Personal Computer Keyboard from 1981 that was once a de facto standard for PC keyboards in the early 1980s. The XT layout was derived from the IBM 5250 typewriter layout originally used on the IBM 525X-83 type Model B. Early PC clones such as 1983's Compaq Portable adopted the layout, propelling it as a standard for a short period of time. XT is specifically known for its high number of stepped keycaps, vertical but thin enter key, and no separation between the alphanumeric and numeric keypad sections. The "XT" name is derived from the IBM 5160 Personal Computer XT to retrospectively distinguish it from the AT layout.
