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Re: Authorative reference to CP437

From: Uma Umamaheswaran <umavs@ca.ibm.com>
Date: Mon, 7 Apr 2008 21:10:34 -0400
To: www-international@w3.org
Message-ID: <OF0C9AF198.7B092987-ON85257425.0005185F-85257425.00067608@ca.ibm.com>


cp437 .. like most code pages designed for the PC .. from its initial
inception was a code page with multiple uses ... one of them was its full
use as a display code page; another one -- in ASCII terminal emulations  --
was with use of C0 part as equivalent of ANSI X3.4 controls (and some
printers use to take additional liberties with these).  The rotation
mentioned was due to older file systems ending up in using SUB as the end
of file !!!

If you want to reference CP 437 call out for its specific use for example
IBM CCSID 437 in the IBM CDRA definition.
You may want to refer to:
http://www-306.ibm.com/software/globalization/cp/cp00437.jsp

http://www.icu-project.org/icu-bin/convexp?conv=ibm-437_P100-1995&s=IBM
shows the controls with the rotation.

See also note about PC Display Graphic character sets in
http://www-306.ibm.com/software/globalization/cdra/appendix_f.jsp


IBM has externalized most of its registered identifiers and their
associated definitions at:

http://www-306.ibm.com/software/globalization/cp/cp_cpgid.jsp
http://www-306.ibm.com/software/globalization/cdra/index.jsp
http://www-306.ibm.com/software/globalization/ccsid/ccsid_registered.jsp
http://www-306.ibm.com/software/globalization/cdra/appendix_g.jsp

V.S. UMAmaheswaran, Ph.D.
Globalization Centre of Competency, IBM Toronto Lab
A2/SZ8, 8200 Warden Avenue, Markham, ON, Canada, L6G1C7; +1 905 413 3474;
Fax:905 413 4682; TieLine 313-3474; email: umavs@ca.ibm.com


                                                                           
             "Frank Ellermann"                                             
             <nobody@xyzzy.cla                                             
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                                       Re: Authorative reference to CP437  
             2008-04-07 20:19                                              
                                                                           
                                                                           
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             <hmdmhdfmhdjmzdtj                                             
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Marcos Caceres wrote:

> ftp://ftp.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/PC/CP437.TXT

Good enough.  The target of http://purl.net/net/cp/437 is not
better.  Do not use this PURL in a standard, its maintenance
is not guaranteed.  The IANA charset registry offers RFC 1345
as another source, but RFC 1345 is not "more authoritative".

As long as you are not interested in the "IBM rotation" for
SUB, DEL, and FS the MS and the IBM mapping are identical.

For another oddity in old MS + PC DOS codepages see
ftp://ftp.unicode.org/Public/MAPPINGS/VENDORS/MISC/IBMGRAPH.TXT

 Frank
Received on Tuesday, 8 April 2008 01:12:00 GMT

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