Nasm is a free assembler for the 80x86 series of microprocessors NASM is an 80x86 assembler designed for portability and modularity. It supports a range of object file formats including Linux a.out and ELF, COFF, Microsoft 16-bit OBJ and Win32. It will also output plain binary files. Its syntax is designed to be simple and easy to understand, similar to Intel's but less complex. It supports Pentium, P6 and MMX opcodes, and has macro capability. It includes a disassembler as well. Version 0.97 was entirely a bug fix release, since 0.96 had more bugs than we could shake a large stick at.