Editing Extended Unix Code (section)

===Mac OS Korean (HangulTalk)===
Other encodings incorporating EUC-KR as a subset include the Mac OS Korean script (known as Code page 10003 or <code>x-mac-korean</code>),<ref name="msdnlabels"/> which was used by HangulTalk (MacOS-KH), the Korean localization of the [[classic Mac OS]]. It was developed by Elex Computer ({{lang|ko|일렉스}}), who were at the time the authorised distributor of Apple Macintosh computers in South Korea.<ref>{{cite web |url=http://hojin.freeservers.com/beige/hom/11HangulTalk.html |title=HangulTalk: De facto standard Hangul environment for Mac |work=Guide to using Hangul on Macintosh |last=Gil |first=Hojin}}</ref><ref name="lunde2009appE"/>

HangulTalk adds extension characters with lead bytes between 0xA1 and 0xAD, both in unused space within the EUC-KR GR plane (trail bytes 0xA1&ndash;0xFE), and using non-EUC codes outside of it (trail bytes 0x41&ndash;0xA0). Some of these characters are font-style-independent stylized [[dingbat]]s.<ref name="lunde2009appE">{{citation|mode=cs1 |title=Appendix E: Vendor Character Set Standards |work=CJKV Information Processing: Chinese, Japanese, Korean & Vietnamese Computing |last=Lunde |first=Ken |author-link=Ken Lunde |year=2009 |edition=2nd |publisher=[[O'Reilly Media|O'Reilly]] |location=[[Sebastopol, CA]] |isbn=978-0-596-51447-1 |url=https://resources.oreilly.com/examples/9780596514471/blob/master/cjkvip2e-appE.pdf}}</ref> Many of these characters do not have exact Unicode mappings, and Apple software maps these cases variously to [[combining character|combining sequences]], to approximate mappings with an appended [[Private Use Area|private-use]] character as a modifier for round-trip purposes, or to private-use characters.<ref name="mackoreantxt">{{cite web |url=https://unicode.org/Public/MAPPINGS/VENDORS/APPLE/KOREAN.TXT |author=Apple |author-link=Apple, Inc |title=Map (external version) from Mac OS Korean encoding to Unicode 3.2 and later |date=2005-04-05 |publisher=[[Unicode Consortium]]}}</ref>

Apple also uses certain single-byte codes outside of the EUC-KR plane for additional characters: 0x80 for a [[required space]], 0x81 for a [[won sign]] (₩), 0x82 for an [[en dash]] (&ndash;), 0x83 for a [[copyright sign]] ({{not a typo|©}}), 0x84 for a wide [[underscore]] ({{not a typo|＿}}) and 0xFF for an [[ellipsis]] (...).<ref name="mackoreantxt" /> Although none of these additional single-byte codes are within the lead byte range of plain EUC-KR (unlike Apple's extensions to EUC-CN, [[#x-mac-chinesesimp|see above]]), some are within the lead byte range of Unified Hangul Code (specifically, 0x81, 0x82, 0x83 and 0x84).