File:Unified Hangul Code.svg

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Description

English: Basic structure of the Unified Hangul Code (UHC), also called Windows-949 or IBM-1363.

The single byte region does not accept a second byte, hence it is shown occupying the entire width of the encoding space diagram. It is either treated as ISO-646-KR (defined by KS C 5636, later renamed KS X 1003), e.g. in localised fonts or IBM's Unicode mapping, or treated as US-ASCII, e.g. in Unicode mapping on Windows.

Standard Wansung codes (as originally defined by KS C 5601:1987, now called KS X 1001:1987) are represented the same as in EUC-KR, i.e. as their ISO 2022 codes designated to GR. Wansung (unlike e.g. the Johab code defined by KS C 5601:1992 annex 3) only encodes the most common Hangul syllables precomposed, not all that could conceivably be required (although it does allow the others to be represented by four-character combining sequences in which the first character is a Hangul Filler). The extended Hangul region encodes all other possible modern-Jamo Hangul syllables in Unicode order, but with those already present in Wansung code skipped. Gaps in the extended Hangul region are due to UHC not using non-alphabetical ASCII bytes as trail bytes. 0x80 and Eight Ones (0xFF) are never used as a lead or trail byte (although they might get best-fit mapped to U+0080 and private use U+F8F7 respectively).

See also:

The WHATWG provide a nice code chart for the double-byte region of what they call "EUC-KR" (but which is actually the entirety of UHC). Warning: Very large HTML table.
ICU demonstration for Windows-949 (with ASCII mappings)
ICU demonstration for IBM-1363 (with ISO 646:KR mappings)

Wansung, Johab and UHC are South Korean encodings. With respect to North Korea, the encoded form of KPS 9566:2003 documented by the Unicode Consortium appears to use a similar and most probably strongly inspired structure, but with a updated revision of KPS 9566:1997 (the DPRK equivalent of Wansung code) in the EUC region, and with a different sequence in the extended Hangul region (due to the Hangul repertoire of KPS 9566:1997 not being the same as that of Wansung, and due to North Korea using a different ordering of the jamo).

Contrast with File:IBM Korea KS PC-Data encoding (IBM-949).svg, which is the IBM-949 encoding, serving to illustrate the different meanings of "code page 949" between Microsoft and IBM (the extensions are mutually incompatible and the common subset is basically just EUC-KR; Windows-949 corresponds to IBM-1363). Also worth comparing and contrasting with File:GBK encoding.svg, another encoding which extends the double byte repertoire of an EUC base encoding, but which takes a different approach in some ways.

한국어: 통합형 한글 코드(w:ko:코드 페이지 949)

Date

1 January 2018

Source

Own work

Author

User:HarJIT

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(Reusing this file)

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Other versions

File:Cp949-map.png Smaller version, raster, older, Korean language text. Not used as a source for this: I only became aware of it subsequent to creating this one.

File history

Click on a date/time to view the file as it appeared at that time.

	Date/Time	Dimensions	User	Comment
current	09:48, 13 December 2021	1,031 × 990 (28 KB)	HarJIT	Yet another font change since Commons no longer has that one either.
	12:27, 4 January 2020	1,031 × 990 (26 KB)	HarJIT	Likewise with the trail bytes.
	19:17, 2 January 2020	1,031 × 990 (26 KB)	HarJIT	0x80 isn't actually used as a lead byte (somehow this had escaped my notice).
	08:27, 5 April 2018	1,031 × 990 (33 KB)	HarJIT	Hopefully makes it less ugly.
	08:22, 5 April 2018	1,031 × 990 (32 KB)	HarJIT	Remove unmatched label.
	08:20, 5 April 2018	1,031 × 990 (34 KB)	HarJIT	Retypeset with Ubuntu font family rather than Roboto, is available on WMF server.
	20:39, 2 January 2018	1,030 × 989 (239 KB)	HarJIT	Evidently I overlooked that.
	20:00, 2 January 2018	1,030 × 989 (231 KB)	HarJIT	Give ranges.
	14:31, 2 January 2018	1,030 × 989 (147 KB)	HarJIT	Mention what the single byte codes are, and give other names for standards.
	21:37, 1 January 2018	1,030 × 989 (119 KB)	HarJIT	Use sane nominal pixel dimensions.