Editing Extended Unix Code (section)

==EUC-TW==
'''EUC-TW''' is a [[variable-width encoding|variable-length encoding]] that supports ASCII and 16 planes of {{nowrap|[[CNS 11643]]}}, each of which is 94×94. It is a rarely used encoding for [[traditional Chinese characters]] as used in [[Taiwan]]. Variants of [[Big5]] are much more common than EUC-TW, although Big5 only encodes the first two planes of CNS&nbsp;11643 [[hanzi]], while [[UTF-8]] is becoming more common.

* As an EUC/[[ISO 2022]] encoding, the [[C0 and C1 control codes#C0|C0 control characters]], ASCII space, and DEL are encoded as in ASCII.
* A graphical character from ASCII (G0, code set 0) is encoded in GL as its usual single-byte representation (0x21–0x7E).
* A character from CNS 11643 plane 1 (code set 1) is encoded as two bytes in GR (0xA1–0xFE).
* A character in planes 1 through 16 of CNS 11643 (code set 2) is encoded as four bytes:
** The first byte is always 0x8E (Single Shift 2).
** The second byte (0xA1–0xB0) indicates the plane, the number of which is obtained by subtracting 0xA0 from that byte.
** The third and fourth bytes are in GR (0xA1–0xFE).

Note that plane 1 of CNS 11643 is encoded twice as code set 1 and a part of code set 2.