The Netwide Assembler: NASM Next Chapter | Previous Chapter | Contents | Index Chapter 3: The NASM Language 3.1 Layout of a NASM Source Line Like most assemblers, each NASM source line contains (unless it is a macro, a preprocessor directive or an assembler directive: see chapter 4 and chapter 5) some combination of the four fields label: instruction operands ; comment As usual, most of these fiel