1. Location Counter (LC) = 0 while line of code <> END if ORG
Assembler Pass I
Location Counter (LC) = 0
while line of code <> END
if ORG
set LC
else
if label
if label already used, error
if EQU
store label in symbol table with evaluated operand
store label in symbol table with value in LC
increment LC by machine code or data size
go to pass II

2. Location Counter (LC) = 0 Assembler Pass II while line of code <> END if assembly directive if ORG, set LC if DC/DS convert operand to binary store in location(s) given by LC increment LC as appropriate else store machine code in location given by LC if symbol in operand get binary equivalent from symbol table evaluate operand and set bits given by LC incrementing LC as necessary PC <= start address from END statement