On 12/11/13 23:37, Charles Swiger wrote:
8-bit variants of ASCII which preserved the 0-127 range and added graphics or printable characters from 128-255 are called "extended ASCII" and started in the 80s with such things as IBM code page 437:
Extended ASCII is a marketing term, not a national standards term, and has been the cause of a lot of confusion. The AS stands for American Standard and the Microsoft code pages are not US national standards.
(Many national and international standards do have ASCII as a subset. The 8 bit one for the US is ISO 8859-1, which is closer to Microsoft 1252 (1252 replaces a secondary set of control characters by additional graphics. ISO 10646 (carefully numbered as ASCII is one of the variants of ISO 646), the code now most generally used, also has ASCII as a subset, and in its UTF-8 representation, ASCII produces the same machine representation (give or take byte order marks). The two common codes used in the Chinese language area, before ISO 10646 became common, also have ASCII as a subset, and represent ASCII text as single bytes. The ability of these codes to represent ASCII one to one is only there because ASCII is a seven bit code, )
_______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
