This is a modified version of NASM, modified and released by H. Peter
Anvin <hpa@zytor.com>; it is not the original form released by the
NASM authors.

The changes include:

1. Merged nasm098p3.zip with nasm-0.97.tar.gz to create a fully
   buildable version for Unix systems (Makefile.in updates, etc.)

2. Changed insns.pl to create the instruction tables in nasm.h and
   names.c, so that a new instruction can be added by adding it *only*
   to insns.dat.

3. Added the following new instructions: SYSENTER, SYSEXIT, FXSAVE,
   FXRSTOR, UD1, UD2 (the latter two are two opcodes that Intel
   guarantee will never be used; one of them is documented as UD2 in
   Intel documentation, the other one just as "Undefined Opcode" --
   calling it UD1 seemed to make sense.)