Editing Extended Unix Code (section)

===IBM code pages 1380, 1381, 1382 and 1383===
[[IBM]] code page 1381 ([[CCSID]] 1381) comprises the single-byte [[code page 1115]] (CPGID 1115 as CCSID 1115) and the double-byte code page 1380 (CPGID 1380 as CCSID 1380),<ref>{{cite web |archive-url=https://web.archive.org/web/20160326215337/http://www-01.ibm.com/software/globalization/ccsid/ccsid1381.html |archive-date=2016-03-26 |url=https://www-01.ibm.com/software/globalization/ccsid/ccsid1381.html |url-status=dead |publisher=[[IBM]] |title= S-Ch PC Data mixed (IBM GB) including 1880 UDC, 31 IBM selected characters and 5 SAA SB characters |work=IBM Globalization: Coded character set identifiers}}</ref> which encodes GB 2312 the same way as EUC-CN, but deviates from the EUC structure by extending the lead byte range back to 0x8C, adding 31 IBM-selected characters in 0x8CE0 through 0x8CFE and adding 1880 [[Private Use Areas#Private-use characters in other character sets|user-defined characters]] with lead bytes 0x8D through 0xA0.<ref>{{cite web |url=https://public.dhe.ibm.com/as400/products/clientaccess/win32/files/globalization/S_Chinese_base1993.pdf |title=IBM Simplified Chinese Graphic Character Set |id=C-H 3-3220-130 1993-11 |date=1993 |publisher=[[IBM]]}}</ref>

IBM code page 1383 (CCSID 1383) comprises the single-byte [[ASCII|code page 367]] and the double-byte code page 1382 (CPGID 1382 as CCSID 1382),<ref>{{cite web |archive-url=https://web.archive.org/web/20160328020818/http://www-01.ibm.com/software/globalization/ccsid/ccsid1383.html |archive-date=2016-03-28 |url=https://www-01.ibm.com/software/globalization/ccsid/ccsid1383.html |url-status=dead |publisher=[[IBM]] |title=CCSID 1383: S-Ch EUC G0 set, ASCII G1 set, GB 2312-80 set (1382) |work=IBM Globalization: Coded character set identifiers}}</ref> which differs by conforming to the EUC structure, adding the 31 IBM-selected characters in 0xFEE0 through 0xFEFE instead, and including only 1360 user-defined characters, interspersed in the positions not used by GB 2312.<ref>{{cite web |url=https://public.dhe.ibm.com/as400/products/clientaccess/win32/files/globalization/S_Chinese_EUC.pdf |title=IBM Simplified Chinese Graphic Character Set for Extended UNIX Code (EUC) |id=C-H 3-3220-132 1994-06 |date=1994 |publisher=[[IBM]]}}</ref> The alternative CCSID 5479<ref>{{cite web |archive-url=https://web.archive.org/web/20160327022059/http://www-01.ibm.com/software/globalization/ccsid/ccsid5479.html |url=https://www-01.ibm.com/software/globalization/ccsid/ccsid5479.html |archive-date=2016-03-27 |url-status=dead |publisher=[[IBM]] |title=CCSID 5479: S-Ch EUC G0 set, ASCII G1 set, GB 2312-80 set (5478) |work=IBM Globalization: Coded character set identifiers}}</ref> is used for the pure EUC-CN code page: it uses CCSID 9574 as its double-byte set, which uses CPGID 1382 but excludes the IBM-selected and user-defined characters.<ref>{{cite web |archive-url=https://web.archive.org/web/20160327042331/http://www-01.ibm.com/software/globalization/ccsid/ccsid9574.html |url=https://www-01.ibm.com/software/globalization/ccsid/ccsid9574.html |archive-date=2016-03-27 |url-status=dead |publisher=[[IBM]] |title=CCSID 9574: S-Ch DBCS PC GB 2312-80 set, excluding 31 IBM selected and 1360 UDC. Also used in T-Ch 2022-CN TCP. |work=IBM Globalization: Coded character set identifiers}}</ref>