Alphanumeric codes should include as a minimum:

• the capacity to represent the alphabet upper- and lowercase characters and the decimal numbers in a straight binary format.
• the capacity to code all possible decimal numbers in a direct octal representation of BCD codes.
• the alphabet upper- and lowercase letters, the decimal digits, the seven punctuation marks, and other characters or symbols.
• the ability to represent decimal numbers greater than 12810 in a straight binary format.