ISO 8859-11
ISO/IEC 8859-11:2001, Information technology — 8-bit single-byte coded graphic character sets — Part 11: Latin/Thai alphabet, is part of the ISO/IEC 8859 series of ASCII-based standard character encodings, first edition published in 2001. It is informally referred to as Latin/Thai. It is nearly identical to the national Thai standard TIS-620 (1990). The sole difference is that ISO/IEC 8859-11 allocates non-breaking space to code 0xA0, while TIS-620 leaves it undefined. (In practice, this small distinction is usually ignored.)
ISO-8859-11 is not a registered IANA charset name despite following the normal pattern for IANA charsets based on the ISO 8859 series. However, the close equivalent TIS-620 (which lacks the non-breaking space) is registered with IANA, and can without problems be used for ISO/IEC 8859-11, since the no-break space has a code which was unallocated in TIS-620. Microsoft has assigned code page 28601 a.k.a. Windows-28601 to ISO-8859-11 in Windows. A draft had the Thai letters in different spots.
As with all varieties of ISO/IEC 8859, the lower 128 codes are equivalent to ASCII. The additional characters, apart from no-break space, are found in Unicode in the same order, only shifted from 0xA1 to U+0E01 and so forth.
The Microsoft Windows code page 874 as well as the code page used in the Thai version of the Apple Macintosh, MacThai, are extensions of TIS-620 — incompatible with each other, however. Unicode and UTF-8 are preferred in modern applications. 0.1% of all web pages use Windows-874 in February 2016.
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Code values D1, D4-DA, E7-EE are for combining characters.
Code page 874, which is also known as CP874 and IBM874, differs from ISO/IEC 8859-11 only eight symbols as shown in the following table:
Legend:
Code page 1161, which is also known as CP1161 and IBM1161, is a variant of Code page 874. The only difference is the euro sign (€) in position DEhex (222).
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