This may be obsolete: (RMK 2021/08)
The following is a listing of the differences between IBM's mappings
of certain IBM code pages and Unicode, and the mappings for IBM code
pages that came from various sources and were earlier made available
at the Unicode ftp site.
The first set of differences refers to tables found originally in the
Microsoft directory at unicode.org. The DBCS tables were in the
EastAsiaMaps directory. The findings are based on the content of the
files as of April 26, 1996. Newer versions may result in fewer
differences.
Note that IBM has many conversion tables to Unicode available in a
binary (machine readable) format on a CD-ROM included with the
document SC09-2190-00 "CDRA Reference and Registry". These tables
are also available in a readable format from IBM. For licensing
information, please contact an IBM representative to the Unicode
council. Currently (March/96) these are:
Dr. V.S. (Uma) Umamaheswaran dorai@vnet.ibm.com
John Gioia gioia@vnet.ibm.com
Lisa Moore lisam@vnet.ibm.com
Or, you may send a note to nltc@vnet.ibm.com.
=======================================================================
Code Pages 00437 (US etc.)
00860 (Portugal)
00861 (Iceland)
00862 (Israel)
00863 (Canadian French)
00865 (Nordic)
Microsoft IBM
--------- -----
0x1A U001A U001C
0x1C U001C U007F
0x7F U007F U001A
0xE6 U00B5 (MICRO SIGN) U03BC (GREEK SMALL LETTER MU)
The "rotation" of the control characters at 0x1A, 0x1C and
0x7F is due to the frequent use of 0x1A as end-of-file by
PC file systems and applications.
=======================================================================
Code Page 00852
Microsoft IBM
--------- -----
0x1A U001A U001C
0x1C U001C U007F
0x7F U007F U001A
0xAA U00AC (NOT SIGN) ---- (Unassigned)
Note that Microsoft code page 852 has a "not sign" in position 0xAA
whereas IBM 852 has 0xAA as unassigned. In IBM mappings, unassigned
code points in a code page are generally mapped to SUB (U001A) in the
binary tables. The readable tables do not contain entries for these
points.
=======================================================================
Code Page 00850 (Latin 1)
00855 (Cyrillic)
00866 (Cyrillic - Russian)
Microsoft IBM
--------- -----
0x1A U001A U001C
0x1C U001C U007F
0x7F U007F U001A
=======================================================================
Code Page 00857 (Turkish)
Microsoft IBM
--------- -----
0x1A U001A U001C
0x1C U001C U007F
0x7F U007F U001A
=======================================================================
Code Page 00864 (Arabic)
Microsoft IBM
--------- -----
0x1A U001A U001C
0x1C U001C U007F
0x7F U007F U001A
0x9B U009B ---- (Unassigned)
0x9C U009C ---- (Unassigned)
0x9F U009F U200C (ZERO WIDTH NON-JOINER)
0xA6 UF8BE ---- (Unassigned)
0xA7 UF8BF ---- (Unassigned)
0xD7 UFEC1 (ISOLATE ARABIC TAH) UFEC3 (MEDIAL ARABIC TAH)
0xD8 UFEC5 (ISOLATE ARABIC DHAH) UFEC7 (MEDIAL ARABIC DHAH)
0xF1 U0651 (ARABIC SHADDAH) UFE7C (ARABIC SPACING SHADDAH)
=======================================================================
Code Page 00869 (Greek)
Microsoft IBM
--------- -----
0x1A U001A U001C
0x1C U001C U007F
0x7F U007F U001A
0x80 U0080 ---- (Unassigned)
0x81 U0081 ---- (Unassigned)
0x82 U0082 ---- (Unassigned)
0x83 U0083 ---- (Unassigned)
0x84 U0084 ---- (Unassigned)
0x85 U0085 ---- (Unassigned)
0x87 U0087 ---- (Unassigned)
0x88 U00B7 (MIDDLE DOT) U0387 (GREEK ANO TELEIA)
0x93 U0093 ---- (Unassigned)
0x94 U0094 ---- (Unassigned)
0xEF U0384 (GREEK TONOS) U00B4 (ACUTE ACCENT)
=======================================================================
Code Page 00874 (Thai)
Microsoft IBM
--------- -----
0x1A U001A U001C
0x1C U001C U007F
0x7F U007F U001A
0x91 U2018 ---- (Unassigned)
0x92 U2019 ---- (Unassigned)
0x93 U201C ---- (Unassigned)
0x94 U201D ---- (Unassigned)
0x95 U2022 ---- (Unassigned)
0x96 U2013 ---- (Unassigned)
0x97 U2014 ---- (Unassigned)
0xA0 U00A0 U0E48 (THAI CHARACTER MAI EK)
0xDB ---- (Unassigned) U0E49 (THAI CHARACTER MAI THO)
0xDC ---- (Unassigned) U0E4A (THAI CHARACTER MAI TRI)
0xDD ---- (Unassigned) U0E4B (THAI CHARACTER MAI CHATTAW)
0xDE ---- (Unassigned) U0E4C (THAI CHARACTER THANTHAKHAT)
0xFC ---- (Unassigned) U00A2 (CENT SIGN)
0xFD ---- (Unassigned) U00AC (NOT SIGN)
0xFE ---- (Unassigned) U00A6 (BROKEN BAR)
0xFF ---- (Unassigned) U00A0 (NO-BREAK SPACE)
=======================================================================
Regarding the mapping table between Unicode and Asian each country's
National Standard, there are several differences between the tables in
this directory and the table developed by IBM.
The following list shows these differences.
=======================================================================
Japanese (JIS X0208)
Unicode IBM
------- -----
(1) 0x213D U2015 U2014
Note:
(1) According to conversion table defined on JIS X0221 (ISO 10646-1
JIS version), JIS:0x213D is mapped to U2014.
=======================================================================
S-Chinese (GB 2312)
Unicode IBM
------- -----
(1) 0x212C U2225 U2016
(2) 0x2327 UFF07 U00B4
Note:
(1) According to GB2312-80 standard, the character name of
GB2312:0x212C is Double Vertical Line. And, U2016 is
Double Vertical Line.
(2) The character name of GB2312:0x2327 is Single Quotation
Mark Right. Though no same character name exists in Unicode,
glyph of U00B4 looks similar than UFF07.
=======================================================================
Please note that it is IBM policy to create a new code page identifier
when there are any changes (other than additions) to a code page.
This allows data or environment tagged with a specific identifier to
have a precise meaning even after many years, and allows migration of
environments (resources such as keyboard drivers, fonts etc..) to be
managed in an orderly manner. This may result in a mismatch between
an IBM identifier and the same identifier used by another vendor if
that other vendor has modified the contents of the code page without
changing the identifier.
Current known cases of a code page not matching the IBM code page using
the same identifier include:
Microsoft 932 (Japanese)
Microsoft 936 (Simplified Chinese)
Microsoft 949 (Korean)
Microsoft 852 (See above)
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