Common Desktop Environment: Internationalization Programmer's Guide

eucTW

The EUC for Traditional Chinese is an encoding consisting of characters that contain single-byte and multibyte (2 and 4 bytes) characters. The EUC encoding conforms to ISO2022 and is based on the Chinese National Standard (CNS) as defined by the Republic of China and the EUC definition, see Table 3-3 .

Table 3-3 Encoding for eucTW


CS	Encoding			Character Set
cs0	0xxxxxxx			ASCII
cs1	1xxxxxxx	1xxxxxxx		CNS 11643.1992 - plane 1
cs2	0x8EA2	1xxxxxxx	1xxxxxxx	CNS 11643.1992 - plane 2
cs3	0x8EA3	1xxxxxxx	1xxxxxxx	CNS 11643.1992 - plane 3
	0x8EB0	1xxxxxxx	1xxxxxxx	CNS 11643.1992 - Plane 16

CNS 11643-1992 defines 16 planes for the Chinese Standard Interchange Code, each plane can support up to 8836 characters (94x94). Currently, only planes 1 through 7 have characters assigned. Table 3-4 shows the 16 planes of the CNS 11643-1992 standard.

Table 3-4 16 Planes of the CNS 11643-1992 Standard


Plane	Definition	# of Character	EUC Encoding
1	Most frequently used	6085	A1A1-FDCB
2	Secondary frequently	7650	8EA2 A1A1 - 8EA2 F2C4
3	Exec.Yuen EDP ¹ center	6148	8EA3 A1A1 - 8EA3 E2C6
4	RIS², Vendor defined	7298	8EA4 A1A1 - 8EA4 EEDC
5	Rarely used by MOE³	8603	8EA5 A1A1 - 8EA5 FCD1
6	Variation char set 1 by MOE	6388	8EA6 A1A1 - 8EA6 E4FA
7	Variation char set 2 by MOE	6539	8EA7 A1A1 - 8EA7 E6D5
8	Undefined	0	8EA8 A1A1 - 8EA8 FEFE
9	Undefined	0	8EA9 A1A1 - 8EA9 FEFE
10	Undefined	0	8EAA A1A1 - 8EAA FEFE
11	Undefined	0	8EAB A1A1 - 8EAB FEFE
12	User Defined Character (UDC)	0	8EAC A1A1 - 8EAC FEFE
13	UDC	0	8EAD A1A1 - 9EAD FEFE
14	UDC	0	8EAE A1A1 - 8EAE FEFE
15	UDC	0	8EAF A1A1 - 8EAF FEFE
16	UDC	0	8EB0 A1A1 - 8EB0 FEFE

1. EDP: Center of Directorate, General of Budget, Accounting, and Statistics

2. RIS: Residence Information System

3. MOE: Ministry of Education