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?