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A computer keyboard with the Esc key in the top-left corner IBM 83-key keyboard (1981), with Esc in the top-left corner of the alphanumeric section. On computer keyboards, the Esc keyEsc (named Escape key in the international standard series ISO/IEC 9995) is a key used to generate the escape character (which can be represented as ASCII code 27 in decimal, Unicode U+001B, or Ctrl+[).
Another example is the Emacs editor, which makes extensive use of modifier keys, and uses the Control key more than the meta key (IBM PC instead has the Alt key) – these date to the Knight keyboard, which had the Control key on the inside of the Meta key, opposite to the Model M, where it is on the outside of the Alt key; and to the space ...
The most common variant is the IBM Enhanced Keyboard identified by IBM assembly part number 1391401, the U.S. English layout keyboard bundled with the IBM Personal System/2. Until around 1993, most Model Ms included a coiled, detachable cable, with either an AT (pre-1987) or PS/2 connector, in 5- and 10-foot lengths (1.5 and 3 meters).
In 1983-1984, during the design phase of the IBM Model M keyboard, the VT220 was a new and very popular product. IBM's design team chose [9] to emulate its LK201 keyboard layout. Key innovations that IBM copied were the inverted-T shape of the arrow cluster, the navigation keys above it, and the numeric keypad off to its right.
Later models replaced this with a numeric keypad, and moved the function keys to 24 keys at the top of the keyboard. The original IBM PC keyboard (PC/XT, 1981) had 10 function keys (F1–F10) in a 2×5 matrix at the left of the keyboard; this was replaced by 12 keys in 3 blocks of 4 at the top of the keyboard in the Model M ("Enhanced", 1984).
The Model F was a series of computer keyboards produced mainly from 1981–1985 and in reduced volume until 1994 by IBM and later Lexmark. [1] Its mechanical-key design consisted of a buckling spring over a capacitive PCB, similar to the later Model M keyboard that used a membrane in place of the PCB.
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The keyboard is optimized for use with the Digital Unix line of operating systems, instead of the OpenVMS operating system for which the LK401 was more suitable. The keyboard is notable for the standard position of the Control key for use with Unix operating systems and an Escape key. The keyboard has two compose keys. There is no separate ...
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