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The use of ASCII format for Network Interchange was described in 1969. [10] That document was formally elevated to an Internet Standard in 2015. [11] Originally based on the (modern) English alphabet, ASCII encodes 128 specified characters into seven-bit integers as shown by the ASCII chart in this article. [12]
In 1973, ECMA-35 and ISO 2022 [18] attempted to define a method so an 8-bit "extended ASCII" code could be converted to a corresponding 7-bit code, and vice versa. [19] In a 7-bit environment, the Shift Out would change the meaning of the 96 bytes 0x20 through 0x7F [a] [21] (i.e. all but the C0 control codes), to be the characters that an 8-bit environment would print if it used the same code ...
The block contains all the letters and control codes of the ASCII encoding. It ranges from U+0000 to U+007F, contains 128 characters and includes the C0 controls , ASCII punctuation and symbols , ASCII digits , both the uppercase and lowercase of the English alphabet and a control character .
The competing 8-bit format EUC-JP, which does not support single-byte halfwidth katakana, allows for a cleaner and more direct conversion to and from JIS X 0208 code points, as all high-bit-set bytes are parts of a double-byte character and all codes from ASCII range represent single-byte characters.
It was designed for backward compatibility with ASCII: the first 128 characters of Unicode, which correspond one-to-one with ASCII, are encoded using a single byte with the same binary value as ASCII, so that a UTF-8-encoded file using only those characters is identical to an ASCII file.
The control code ranges 0x00–0x1F ("C0") and 0x7F originate from the 1967 edition of US-ASCII.The standard ISO/IEC 2022 (ECMA-35) defines extension methods for ASCII, including a secondary "C1" range of 8-bit control codes from 0x80 to 0x9F, equivalent to 7-bit sequences of ESC with the bytes 0x40 through 0x5F.
Block range Historical block name Version when added Version when removed Range now occupied by Superseded by block Code points Assigned characters Scripts; U+1000..U+105F Tibetan [5] 1.0.0 1.0.1 Myanmar: Tibetan: 96 71 Tibetan: U+3400..U+3D2D Hangul [6] 1.0.0 2.0 CJK Unified Ideographs Extension A: Hangul Syllables: 2350 2350 Hangul: U+3D2E ...
This is simply the ASCII character codes from 32 to 95 coded as 0 to 63 by subtracting 32 (i.e., columns 2, 3, 4, and 5 of the ASCII table (16 characters to a column), shifted to columns 0 through 3, by subtracting 2 from the high bits); it includes the space, punctuation characters, numbers, and capital letters, but no control characters.