telecode man page on DigitalUNIX

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telecode(5)							   telecode(5)

NAME
       telecode	 -  A character encoding system (codeset) for Traditional Chi‐
       nese

DESCRIPTION
       The Telecode codeset (called Mitac Telex in early versions of the oper‐
       ating  system) consists of 2 character planes. Each character plane has
       8836 character positions. In plane 1, standard characters occupy	 posi‐
       tions  0001  to	8045; the remaining 791 positions are for user-defined
       characters. In plane 2, standard characters occupy  positions  0001  to
       8489;  the  remaining  346  positions  are for user-defined characters.
       Telecode uses 2-byte values to represent characters on both planes.

   Plane 1 Character Encoding
       To differentiate plane 1 code from plane 2 code, the  most  significant
       bit (MSB) is set on in both bytes of a plane 1 character code. The fol‐
       lowing formula calculates the value of a plane  1  character  from  its
       position on the plane:

       1st byte = M + 161
       2nd byte = N + 161 - M x 94

       In this formula, N is the position of the character and M = N / 94.

       For  example, if a character is at position 2502 on plane 1, its encod‐
       ing value is BBDB, which is calculated as follows:

       N = 2502, M = 2502/94 = 26 1st byte = 26 + 161 = 187 2nd byte = 2502  +
       161 - 26 x 94 = 219

   Plane 2 Character Encoding
       To  differentiate  plane 2 code from plane 1 code, the MSB of the first
       byte is set on and that of the second byte is set off for each plane  2
       character code. The following formula calculates the value of a plane 2
       character from its position:

       1st byte = M + 161
       2nd byte = N + 33 - M x 94

       In this formula, N is the position of the character on  the  plane  and
       M = N / 94.

       For  example, if a character is at position 2502 on plane 2, its encod‐
       ing value is BB5B, which is calculated as follows:

       N = 2502, M = 2502/94 = 26 1st byte = 26 + 161 = 187 2nd byte = 2502  +
       33 - 26 x 94 = 91

   Codeset Conversion
       The following codeset converter pairs are available for converting Tra‐
       ditional Chinese characters between telecode and	 other	encoding  for‐
       mats.   Refer  to iconv_intro(5) for an introduction to codeset conver‐
       sion. For more information about the other codeset for  which  telecode
       is  the	input  or output, see the reference page specified in the list
       item.  big5_telecode, telecode_big5

	      Converting from and to the Big-5 codeset: big5(5).

	      Note that Big-5 encoding is equivalent to	 the  Microsoft	 code-
	      page  format used on PCs for Traditional Chinese. You can there‐
	      fore use these converters to convert Traditional Chinese charac‐
	      ters  between  PC code page format and Telecode encoding format.
	      For more information on how the  operating  system  supports  PC
	      code   pages,   see   code_page(5).    dechanyu_telecode,	 tele‐
	      code_dechanyu

	      Converting from and  to  the  DEC	 Hanyu	codeset:  dechanyu(5).
	      eucTW_telecode, telecode_eucTW

	      Converting from and to Taiwanese Extended UNIX Code: eucTW(5).

   Font Support for Telecode
       The  operating  system  supports	 Telecode  only	 through conversion to
       another codeset.

SEE ALSO
       Commands: locale(1)

       Others:	ascii(5),  big5(5),  Chinese(5),  code_page(5),	  dechanyu(5),
       dechanzi(5),  eucTW(5),	GB18030(5), GBK(5), i18n_intro(5), i18n_print‐
       ing(5), iconv_intro(5), l10n_intro(5), sbig5(5)

								   telecode(5)
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