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Bit-paired keyboard
A bit-paired keyboard is a keyboard where the layout of shifted keys corresponds to columns in the ASCII (1963) table, archetypally the Teletype Model 33 (1963) keyboard. This was later contrasted with a typewriter-paired keyboard, where the layout of shifted keys corresponds to ''electric'' typewriter layouts, notably the IBM Selectric (1961). The difference is most visible in the digits row (top row): compared with mechanical typewriters, bit-paired keyboards remove the _ character from 6 and shift the remaining &
*() from 7890 to 6789, while typewriter-paired keyboards replace 3 characters: from " to @ from _ to ^ and from ' to
*. An important subtlety is that ASCII was based on mechanical typewriters, but electric typewriters became popular during the same period that ASCII was adopted, and made their own changes to layout.〔(【引用サイトリンク】url=http://www.quadibloc.com/comp/kybint.htm )〕 Thus differences between bit-paired and (electric) typewriter-paired keyboards are due to the differences of both of these from earlier mechanical typewriters.
Bit-paired keyboards were common in the United States in the 1960s and 1970s, due to ease of manufacture, but died out in the late 1970s with office automation, due to the number of users already accustomed to (electric) typewriter layouts. Bit-paired keyboard layouts survive today only in the standard Japanese keyboard layout, which has all shifted values of digits in the bit-paired layout.
==Technical details==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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