Personal Computer from the Inside Out: The Programmer's Guide to Low-Level PC Hardware and Software (3rd Edition) (Paperback)by Murray, III Sargent (Author), Richard L. Shoemaker (Author)

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If you really want to know what really makes the PC works, read this one. It really helps people to understand the logic process that is inside each PC component. It teaches you the bases of electronics, from the diode to the serial ports, and Pentium processor. The explanations are simple, but it does not goes in deep, leaving you with the necessary knowledge to just understand the innerworkings of the computer, no to make one from the scratch.
The assembler part is very good,but it is intended for people with medium level skills in programming, hard to understand if your are a beginner.
I gave 4 stars because this book is a bit older, it does not cover things like the new USB, PCMCIA III, and DVD topics. I really use it as a reliable refference material.