Digits: 0: O 1: A 2: B 3: C Quaternary and Hexadecimal are compact forms of Binary. Hexadecimal is a compact form of Quaternary and Binary. Hexadecimal Converter: https://scratch.mit.edu/projects/1008377576/ Typeable Hexadecimal Converter: https://scratch.mit.edu/projects/1018564479/
