Source text can be formatted freely. If more than one statement is written on a line, then the individual statements have to be separated by a semicolon (':'). Comments start with the keyword REM or an exclamation mark '!' and go up to the line end. It is also possible to use comments beginning in the middle of a line (multi-line comments); they start wit "/*" and end with "*/". Nesting comments is not allowed.
In the program text the upper and lower case does not play a role.