;;yhx0 ; this is a comment, you can put digits there : 0123456789ABCDEFabcdef ; empty lines are ok : ; address specifier 01 23 45 67 89 Ab cD Ef ; data are represented in bytes, ; they must come as pairs of hexadecimal digits. ; the case is not meaningful. ; they can be separated by other characters, ; or even glued together, but a space is recommended and safest. FE FF ABCDEF