Hi all,
There is a book regarding BIOS disassembly (reverse engineering) subject right now. You may want to check it out:

http://www.amazon.com/BIOS-Disassembly-Ninjutsu-Uncovered/dp/1931769605

Perhaps this book will enlighten you in the detail of BIOS reverse engineering. I don't mean to advertise it here. It's just to help out those who wants to know about it in detail. It may be pretty tough to understand for those not proficient enough in assembly language.

greetz,
Pinczakko

PS: There should be a Russian version of the book. I'll ask Natalia Tarkova (my chief editor) about it because it's mentioned in the book writing contract. I think the people at BHV Publishing (www.bhv.ru) currently working on it if it's not yet done.