The jacking equipment is at old mechanical typewriters a key, by for whose pressures the indication allocation of the keyboard of small on capital letters changes. The change applies up to releasing, if the Feststelltaste is not engaged.

The keys of a mechanical typewriter were directly connected with in each case a lever ("„type "“), were attached on which two indications. Depending on whether the car (typewriter) - which mobile device, in which the paper was clamped - in the lowered or raised condition was, met then the lower or upper indication that the paper pre-aged ribbon. The lower indication level contained mainly the small letters and numbers, in the upper level was however the capital letters and some special characters accommodated.

With the computer keyboard, which is shared this very day to that the typewriter, the SHIFT key takes over the function of the jacking equipment. In order to be able to take up all 94 visible indications of the ASCII character set, a US keyboard possesses 47 keys and SHIFTs. In addition naturally still the space bar and some keys come to the controlling of the software.

On many computer keyboards is today also a alto Gr key, which releases the entrance to further indications. In combination with the SHIFT key so altogether four indication levels result.

Illustration: German keyboard under X11 (keys sorts to left edge):

|| |||||| \ || ||"¨||^||"¸||~|| `| - align= " centers "! align= |nur Shift|"°|| " left "! ||>||Q||A|| " ||Y||W||S||"§||X||E||D||$||C||R||F||%||V||T||G||&||B||Z||H||/||N||U||J|| (||M||I||K||) ||; ||O||L||=||: ||_||œ||„|| `||*||'| align= " centers "! align= |nichts ||o||l||0||.||p||||ss||-||||¤||"´||+||#| " left "} (illustration suggestion: mirror-wrong photo of the types of a typewriter to the comparison)

See also: Carriage return, tabulator, space bar

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