If a ‘#’ appears as the first character of a line then the whole
line is treated as a comment, but in this case the line could also be
a logical line number directive (see Comments) or a preprocessor
control command (see Preprocessing).
The Z80 assembler does not support a line separator character.
The dollar sign ‘$’ can be used as a prefix for hexadecimal numbers
and as a symbol denoting the current location counter.
A backslash ‘\’ is an ordinary character for the Z80 assembler.
The single quote ‘'’ must be followed by a closing quote. If there
is one character in between, it is a character constant, otherwise it is
a string constant.