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The keyboard for IBM PC-compatible computers is standardized. However, during the more than 30 years of PC architecture being frequently updated, many keyboard layout variations have been developed. A well-known class of IBM PC keyboards is the Model M.
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).
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.
The layout of the keyboard prefigured the IBM Model M keyboard, with function keys arranged in a row at the top, instead of on the left as in the PC and PC XT/AT. Later models of the Tandy 1000 series, such as the 1000 SL, TL, and RL series use a keyboard more similar and compatible with the IBM PS/2 series keyboard connector and layout.
American typewriter keyboard layout Selectric III keyboard layout. The Selectric's keyboard layout put the underscore, hyphen, and single and double quote characters as pairs on their own keys – an arrangement which had already been used on many earlier electric typewriters, including IBM's own Model A onwards. The traditional layout of ...
The German keyboard layout is family of QWERTZ keyboard layouts commonly used in Austria ... Detail of a keyboard of a German IBM Portable PC 5155, produced about ...
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.
The PS/2 IBM Model M keyboard used the same 101-key layout of the previous IBM PC/AT Extended keyboard. [9] European variants had 102 keys with the addition of an extra key to the right of the left Shift key.
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