describe:

	describe literal numbers / constants, bases, format for hex number (e.g. $abc, 0xabc), how hex
	number beginning with $ differs for location counter which is $ on its own. describe octal
	base numbers (e.g. 0776)

	expression folding (assember evaluated expressions) - static evaluation V dynamic evaluation

	strings, string delimiters, special escape sequences (brief intro to format strings with ref
	to more detailed explanation)

	expressions involving strings (generating strings)

	converting strings to labels and vica versa

	using string in place of label or as name of assembler variable

	explain about label definitions not being restricted to starting in column 1, the benefits
	and potential pitfalls (pro: allows definition to be indented depending on conditional assembly,
	con: allows undefined macros to be mistaken for label definitions)

	describe comments (always need ';' even at end of machine instruction)

	describe valid label format, always begins with [a-zA-Z] can include any char [a-zA-Z0-9_],
	can be any length. stress that case is important in labels

	explain about location counter refering to words in program space (.code) and bytes in data
	space (.data)

	explain about indf and fsr

	explain about label phase errors
		* macro defined after first use
		* non local label used in macro 
		* conditional statement including code in one pass but not the other
		* label defined using .equ statment refers to relocatable code or data
		  section (use assembler variable instead)
		* using assembler variable value that is not generated the same way for each
		  pass
		* using conditional assembly conditional on defined label before label is
		  defined - first pass will see the label as undefined, second pass will see
		  the label as defined.

	give concrete examples of operators
		| or
		& and
		^ xor
		~ complement
		|| logical or
		&& logical and
		! logical not
		>> shift right
		<< shift left

	explain about the logical values 0 and 1 returned by the logical operators and how
	these values can be used in static expressions as well as conditional and loop
	statements. give concrete examples involving strings, numbers and labels (using the
	defined assembler function)
		>	greater than
		>=	greater than or equal to
		<	less than
		<=	less than or equal to
		==	equal to
		!=	not euqal to

	explain about macro argument seperators ',' also difference between formal parameters
	and actual parameters. also about null actual parameters

	explain about macro recursion

	explain about no linker

	explain how assembler listing contains fully relocated absolute listing (sections are
	ordered according to group statements and addresses are added to assembler listing -
	sometimes out of lexical order because of the group/section requirements)

	explain how the output is generated in hex (and which hex format is used).

	explain about what files are generated (e.g. *.lst, *.hex, *.xsm, *.dbg)