Code page 950

Code page 950 is Microsoft's implementation of the de facto standard Big5. The code page is not registered with IANA,^[1] and hence, is not a standard to communicate information over the internet. The major difference between code page 950 and Big5 is the incorporation of some ETEN characters at F9D6-F9FE (碁, 銹, 裏, 墻, 恒, 粧, and 嫺) and 34 box drawing characters and block elements. It was updated in 2000 with the addition of the euro sign (€), at 0xA3E1. This update is called Code page 1370 by IBM (as IBM did not change Code page 950), but Microsoft Windows refers to it as a Code page 950 update.

Code page 951

Code page 951 is a misnomer for a hack used in HKSCS-2001 support in Windows XP, derived from the file name.^[2] The "new" code page is a replacement for CP950 with Unicode mappings for some Extended User-defined Characters (EUDC) found in HKSCS. HKSCS characters without a Unicode mapping are assigned a Unicode Private Use Area (PUA) code point following previous practises.

Private Use Area usage

Mapping from Big5 EUDC to PUA code points^[3]

Big5 range	Unicode range	Formula[4]
81 40–8D FE	U+EEB8–U+F6B0	0xeeb8 + (157 * (H-0x81)) + (L<0x80)?(L-0x40):(L-0x62)
8E 40–A0 FE	U+E311–U+EEB7	0xe311 + (157 * (H-0x8e)) + (L<0x80)?(L-0x40):(L-0x62)
C6 A1–C8 FE	U+F6B1–U+F848	0xf672 + (157 * (H-0xc6)) + (L<0x80)?(L-0x40):(L-0x62)
FA 40–FE FE	U+E000–U+E310	0xe000 + (157 * (H-0xfa)) + (L<0x80)?(L-0x40):(L-0x62)

This mapping is also used in HKSCS where a given glyph is not yet found in the Unicode revision specified.^[5]

See also

• LMBCS-18

References

2. Steele, Shawn. "CP 951 & HKSCS". I'm not a Klingon. MS Dev Blog. Retrieved 13 September 2016.
3. "Windows Best Fit Chart: CP950". unicode.org. Retrieved 13 September 2016.
4. "Big5". Kanji Database. Retrieved 13 September 2016.
5. "Big5-HKSCS:2008". Archived from the original on 2016-09-13.

External links

• Microsoft's Reference for Code Page 950
• Mapping of Code Page 950 to Unicode