- Uppercase and lowercase letters A through Z
- Numbers 0 through 9
- National characters:
- At sign @
- Dollar sign $
- Pound sign #
Note: The following hexadecimal representations are recognized as the U.S. National characters:
@ as X'7C'
$ as X'5B'
# as X'7B'
In countries other than the U.S., the U.S. National characters represented on terminal keyboards might generate a different hexadecimal representation and cause an error. For example, in some countries, the $ character might generate a X'4A'.