ASCII code chart needed

Curiosity

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Is there any app for Macs which will display an ASCII code chart for all the keys on the keyboard? Preferably it would give the codes in both hexadecimal and decimal (but just hex would do).
 
Thanks, but I wanted something that would give me a whole chart at once, not have to press each key individually to get the ASCII code. It finally occurred to me to look for a widget, and I found one.
Now I am very puzzled. I wanted to use a filename starting character with an ASCII code larger than that for z, to put a file at the end of a file listing and keep it there, so tried to use a tilde, then a pipe symbol when the tilde failed to do it. A filename beginning with those symbols is listed first, not last. Why? Tilde has a code of 7E, and pipe is 7C, while lower case z is 7A. Does Mac OS not list names in ASCII order?
 
Here's a few examples that will take a file to the end of a sort list
http://hints.macworld.com/article.php?story=20020205012627411

Also, according to this Apple support article, sorting in the Finder is based on the Unicode Collation Algorithm - http://support.apple.com/kb/TA22935?viewlocale=en_US
So - technically, not ASCII at all, which does not really relate to Unicode.
Unicode, in theory, provides support for all possible characters used by all languages, so something like character sort order is determined by the language in use at the time.
Here's a factoid for you: ASCII originally included 128 characters, extended to 256.
Unicode has provision for 1,114,112 characters, but has only 96,000 of those points assigned (!)
Lots of (good?) information here: http://ascii-table.com/unicode.php
 
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