Talk:Extended ASCII

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Shouldn't the Unicode input methods require a page of its own? Or should it be made an item in Unicode? — Hhielscher

moved it to Unicode, as (Unicode in use).(Input methods). --Mac-arena the Bored Zo 15:21, 2004 Dec 28 (UTC)

[edit] Charset table as ACII

I removed the following section. See below for rationale. --Pjacobi 10:51, September 5, 2005 (UTC)

Extended ASCII Table

Image:Exascii.jpg

Extended ASCII uses 8 digits of 1's and 0's for a total of 256 characters. The first 32 however cannot be shown as they are special control sequences and thus they cannot be printed. Also the two blanks are space characters.

IMHO this section is a bad idea for two reasons:

  • Giving some specific charset, whereas the article correctly states, that there are plenty.
  • Using graphics for a text table

10:51, September 5, 2005 (UTC)

I agree on the second reson just some of the charecters cant be displayed on the web as far as I know If anyone knows a way a regular table would be nicer. However on the first part ASCII has a table plus I believe a table could be beneficial and a major point of interest it can teach you a fair amount about computers. Or maybe a text table of 00100001 through 01111110 (! through ~ on the chart) as they are the most common used? or just 0-9 and A-Z? --Shimonnyman 11:28, 5 September 2005 (UTC)
There is an ASCII table in ASCII.
Extended ASCII tables are in ISO 8859-1, ISO 8859-2, ISO 8859-3, ISO 8859-4, ISO 8859-5, ISO 8859-6, ISO 8859-7, ISO 8859-8, ISO 8859-9, ISO 8859-10, ISO 8859-11, ISO 8859-13, ISO 8859-14, ISO 8859-15, ISO 8859-16, Code page 437, Code page 850, Code page 858, KOI8-R, KOI8-U, TSCII, Mac-Roman encoding, Kamenicky encoding (list is incomplete).
Pjacobi 13:19, September 5, 2005 (UTC)

Those arent Extended ASCII binary tables, thats what i was refering to thinking could help but the ASCII table on the ASCII page appears to be extended ASCII (a bit incomplete) I didnt check every code but every one i checked was extended ASCII and they arent the same in both because well obviously 7-bit and 8-bit arent going to look identicle. So maybe it belongs here, I dont know anyways just observing.


[edit] How are They Stored?

If you have a string of characters, how does one differentiate between two different code pages? I'd imagine that some form of escape character would be used. For example, if I'm writing using ISO-88591 and want to switch over to greek, what is the internal change, on non-unicode terminals? 66.190.72.225 07:23, 26 November 2005 (UTC)

In general, the only way to conclusively know the encoding of a sequence of bytes is with some out of band meta-information. For example, MIME and HTTP use the Content-Type header to specify the character set and encoding.
For your second question, it sounds like you want to mix characters from different character sets. That is difficult or impossible to do without Unicode. There are some encoding formats, such as ISO-2022 that permit mixing encodings, but Unicode is generally the best choice. 216.113.168.128 20:04, 21 December 2005 (UTC)
Some programs like Microsoft Internet Explorer try to "guess" the code page based on how the text looks like in each code page 84.58.183.1 21:27, 25 April 2007 (UTC)