If you are interested in programming the FPU (floating-point unit) in assembly, you are either bored or deeply disturbed. My apologies to those few of you writing compilers or low-level operating system kernels who actually need to know how to do this! Then again, you may just be curious. Other books tend to stick this topic in the section beginning with "F," or somewhere buried in the back in an appendix, and maybe 1% of the readers actually even glance at it. Some people have been known to tape those pages together or just rip them out of their book (not my book) altogether. If C/C++ is good enough for you to handle your floating-point math, then just skip this section.