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The areas indicated in the previous section as GBK/1 and GBK/2, taken by themselves, is simply GB 2312-80 in its usual encoding, GBK/1 being the non-hanzi region and GBK/2 the hanzi region. GB 2312, or more properly the EUC-CN encoding thereof, takes a pair of bytes from the range A1 – FE , like any 94² ISO-2022 character set loaded into GR.
The Windows console uses code page 936 as the default code page for simplified Chinese installations, although part of the GB 18030 was made mandatory for all software products sold in China. In 2002, the IANA Internet name GBK was registered with Windows-936's mapping, [2] [3] making it the de facto GBK definition on the Internet.
IBM code page 936 should not be confused with the identically numbered Windows code page, which is a variant of the GBK encoding; [2] GBK is called Code page 1386 by IBM. While GBK is a superset of the EUC-CN encoding of GB 2312 , IBM-936 uses a different coded form of GB 2312, more closely resembling the relationship of Shift JIS to JIS X 0208 .
A code point is a value or position of a character in a coded character set. [10] A code space is the range of numerical values spanned by a coded character set. [10] [12] A code unit is the minimum bit combination that can represent a character in a character encoding (in computer science terms, it is the word size of the character encoding).
In addition to Unicode (with the set of CJK Unified Ideographs), local encoding systems exist. The Chinese Guobiao (or GB, "national standard") system is used in mainland China and Singapore , and the (mainly) Taiwanese Big5 system is used in Taiwan , Hong Kong and Macau as the two primary "legacy" local encoding systems.
While GB/T 2312 covers over 99.99% contemporary Chinese text usage, [8] historical texts and many names remain out of scope. Old GB 2312 standard includes 6,763 Chinese characters (on two levels: the first is arranged by reading, the second by radical then number of strokes), along with symbols and punctuation, Japanese kana, the Greek and Cyrillic alphabets, Zhuyin, and a double-byte set of ...
The encoding scheme stays the same in the new version, and the only difference in GB-to-Unicode mapping is that GB 18030-2000 mapped the character A8 BC (ḿ) to a private use code point U+E7C7, and character 81 35 F4 37 (without specifying any glyph) to U+1E3F (ḿ), whereas GB 18030-2005 swaps these two mapping assignments.
Shift JIS is an extension of the single-byte encoding JIS X 0201:1997, that uses unassigned code points in JIS X 0201 to encode the double-byte JIS X 0208:1997 character set. The lead bytes for the double-byte characters are "shifted" around the 64 halfwidth katakana characters in the single-byte range 0xA1 to 0xDF .