as: MMIX-Chars

 
 9.27.3.1 Special Characters
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 The characters '*' and '#' are line comment characters; each start a
 comment at the beginning of a line, but only at the beginning of a line.
 A '#' prefixes a hexadecimal number if found elsewhere on a line.  If a
 '#' appears at the start of a line the whole line is treated as a
 comment, but the line can also act as a logical line number directive
DONTPRINTYET  (SeeComments) or a preprocessor control command (*noteDONTPRINTYET  (SeeComments) or a preprocessor control command (See
 Preprocessing).
 
    Two other characters, '%' and '!', each start a comment anywhere on
 the line.  Thus you can't use the 'modulus' and 'not' operators in
 expressions normally associated with these two characters.
 
    A ';' is a line separator, treated as a new-line, so separate
 instructions can be specified on a single line.