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Half-width kana were developed as "... the first Japanese characters encoded on computers because they are used for Japanese telegrams." [1] The Nationwide Banking Data Communication System ( 全国銀行データ通信システム ) , the largest funds transfer system in Japan, was established in 1973.
In CJK (Chinese, Japanese, and Korean) computing, graphic characters are traditionally classed into fullwidth [a] and halfwidth [b] characters. Unlike monospaced fonts, a halfwidth character occupies half the width of a fullwidth character, hence the name.
Used to switch between entering Japanese and English text. It is not found as a separate key in the modern Japanese 106/109-key keyboard layout. On the Common Building Block (CBB) Keyboard for Notebooks, as many 106/109-key keyboards, the Kanji key is located on the Half-width/Full-width key, and needs the key ALT. It is found as a separate ...
Range U+FF61–FF9F encodes halfwidth forms of katakana and related punctuation in a transposition of A1 to DF in the JIS X 0201 encoding – see half-width kana. The range U+FFA0–FFDC encodes halfwidth forms of compatibility jamo characters for Hangul, in a transposition of their 1974 standard layout.
A typical Japanese character is square while Roman characters are typically variable in width. Since all Japanese characters occupy the space of a square box, it is sometimes desirable to input Roman characters in the same square form in order to preserve the grid layout of the text.
Embedded devices are still using half-width kana. The first encoding to become widely used was JIS X 0201, which is a single-byte encoding that only covers standard 7-bit ASCII characters with half-width katakana extensions. This was widely used in systems that were neither powerful enough nor had the storage to handle kanji (including old ...
JIS X 0201, the Japanese version of ISO 646 containing the base 7-bit ASCII characters (with some modifications) and 64 half-width katakana characters. JIS X 0208 , the most common kanji character set containing 6,879 characters, including 6,355 kanji and 524 other characters (one 94 by 94 plane)
Japanese punctuation marks are usually "full width" (that is, occupying an area that is the same as the surrounding characters). Punctuation was not widely used in Japanese writing until translations from European languages became common in the 19th century. [1]