Welcome to the books section, located here is a list of books that can help you on DreamOS related topics. To recommend a book send an e-mail to dc-dreamos-main@lists.sourceforge.net.
Operating System Concepts Fifth Edition
This is a very complete book covering basic and advanced operating system theories and concepts.
Assembly Language For Intel-Based Computers
Despite the title this is a good book on the basics of assembly and processor architecture, which you can easily adapt to the Hitachi (good luck finding a Hitachi ASM book).