The book goes all the way up to discussing the 386. It's just that the foundations is rooted in 8086, which is a large chunk of the book.
My favorite books (or the ones I have spend most time with) and that have been most formative for me are:
Mastering Turbo Assembler by Tom Swan
Zen of Graphics Programming by Michael Abrash
The Zen Of Assembly Language by Michael Abrash
Programmer's Guide to the EGA, VGA, and Super VGA Cards by Richard F. Ferraro
The Indispensable PC Hardware Book by Hans-Peter Messmer