Appendix 2 — Expressions and Numeric Forms

Operator table

Operators appear from lowest to highest precedence. Operators at the same level associate from left to right.

Operator	Operation	Precedence
|	Bitwise OR	1
^	Bitwise XOR	2
&	Bitwise AND	3
<<	Left shift	4
>>	Right shift	4
+	Add	5
-	Subtract	5
*	Multiply	6
/	Integer division, truncating towards zero	6
%	Remainder with the dividend's sign	6
unary +	Identity	7
unary -	Negation	7
~	Bitwise NOT	7

Parentheses and values have the highest precedence. Shift counts range from 0 through 23.

Numeric forms

Form	Example	Base	Notes
Plain decimal	42	10	0 through 65,535
$ prefix	$2A	16	Bare $ is the current output address
Intel H suffix	02AH	16	Must begin with a decimal digit
% prefix	%101010	2	% between expressions is remainder
Intel B suffix	101010B	2	Must contain only binary digits
Character	'A'	—	Decodes to exactly one byte

Numeric syntax is case-insensitive. 0FFH is hexadecimal 255; FFH is a symbol name because it begins with a letter.

Concrete and forward domains

Concrete evaluation uses signed 24-bit intermediates and accepts a final value from −32,768 through 65,535. The receiving field applies its own range.

A forward value stores one symbol plus an addend from −128 through 127. Addition and subtraction are accepted only while they preserve that affine form. LOW() and HIGH() may be its outermost operation.

Form	Forward status
TARGET	Accepted
TARGET+5	Accepted
5+TARGET	Accepted
TARGET-(2*3)	Accepted
LOW(TARGET+1)	Accepted in compatible byte fields
TARGET1+TARGET2	Rejected
TARGET*2	Rejected
-TARGET	Rejected
LOW(TARGET)+1	Rejected