An extremely simple file that takes the serial id of a field and converts that into visible characters in a calculated field: char(serialnbr). Also on te list layout are about 12 fields, each formatted with a different font to show how the characters look in that font. Note that there are graphic fonts which display 'icons' but I only found one or two by trial and error.
Keep adding records and you will see additional visible characters.
Previously i had scraped text from pages about ascii but this method is so much easier.
You can search in a char field and find what the number is. For instance, the char(160) produces the copyright symbol in a text string:
set variable ( $$_copyright ; Char(169) & "2016 Jack Rodgers, Jr." )