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On [[Unix]] platforms, the ISO 2022 7-bit encodings were replaced by a set of 8-bit encoding schemes, the Extended Unix Code: EUC-JP, EUC-CN and EUC-KR. Instead of distinguishing between the multiunit sequences and the singletons with escape sequences, which made the encodings stateful, multiunit sequences were marked by having the most significant bit set, that is, being in the range 80-FF, while the singletons were in the range 00-7F alone. The lead units and trail units were in the range A1 to FE, that is, the same as their range in the ISO 2022 encodings, but with the high bit set to 1. Theese encodings are reasonablly easy to work with provided you were only interested in searching and cutting at ascii characters but a break in the middle of a multi-byte character could still cause major curruption.
On the PC ([[MS-DOS]] and [[Microsoft Windows]] platforms), two encodings became established for Japanese and Traditional Chinese in which all of singletons, lead units and trail units overlapped: [[Shift-JIS]] and [[Big5]] respectively. In Shift-JIS, lead units had the range 81-9F and E0-FC, trail units had the range 40-7E and 80-FC, and singletons had the range 21-7E and A1-DF. In Big5, lead units had the range A1-FE, trail units had the range 40-7E and A1-FE, and singletons had the range 21-7E. This again made processing tricky.<!--FIXME: GBK should probabbly also be mentioned here-->
==Unicode variable-width encodings==
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