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The meaning of each codepoint in the 129–256 (xA1–xFF) 'extended' range can be different in every encoding. In order to correctly interpret and display text data (sequences of characters) that includes extended codes, the software that reads or receives the text must use the specific extended ASCII encoding that was used to create it ...
For example, an ASCII (or extended ASCII) scheme will use a single byte of computer memory, while a UTF-8 scheme will use one or more bytes, depending on the particular character being encoded. Alternative ways to encode character values include specifying an integer value for a code point, such as an ASCII code value or a Unicode code point.
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).
As a result, high-quality typesetting systems often use proprietary or idiosyncratic extensions on top of the ASCII and ISO/IEC 8859 standards, or use Unicode instead. An inexact rule based on practical experience states that if a character or symbol was not already part of a widely used data-processing character set and was also not usually ...
ISO-8859-7 is the IANA preferred charset name for this standard (formally the 1987 version, but in practice there is no problem using it for the current version, as the changes are pure additions to previously unassigned codes) when supplemented with the C0 and C1 control codes from ISO/IEC 6429.
Code page 1111 is similar, but replaces byte B0 ° (degree sign) with U+02DA ˚ (ring above). Windows-1250 is similar to ISO-8859-2 and has all the printable characters it has and more. However a few of them are rearranged (unlike Windows-1252 , which keeps all printable characters from ISO-8859-1 in the same place).
ASCII codes represent text in computers, telecommunications equipment, and other devices. ASCII has just 128 code points, of which only 95 are printable characters, which severely limit its scope. The set of available punctuation had significant impact on the syntax of computer languages and text markup.
ISO-8859-6 is the IANA preferred charset name for this standard when supplemented with the C0 and C1 control codes from ISO/IEC 6429. The text is in logical order, so BiDi processing is required for display. Nominally ISO-8859-6 (code page 28596) is for "visual order", and ISO-8859-6-I (code page 38596) is for logical order.