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 (Comments) or a preprocessor control command (*noteDONTPRINTYET (Comments) or a preprocessor control command (
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.