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Protected Mode
Protected mode is what most modern Operating systems are based around, without it, you would only beable to access 1MB of memory, and the slightest bug in any of you code could crash your system. Protected mode offers many advantages, you can stop programs overwritting each other, you can access 4Gb of memory. The main disadvantage being you cannot access the BIOS, but again, thes gives you an advantage because it forces you to write your own drivers which not only gives you more control over the system, but the BIOS's drivers are very slow and cumbersome. You may want to see my hardware section for driver info etc.
Beginners tutorial to Pmode
Very good, code for TASM.
pmbasics
Documented source code
code32
Source code and documentation
pmcom01
Documented source code for NASM.
386intel.txt
Contains everything, but its not the best explained (written by Intel)
Copyright© 1999 by Gareth Owen.
All rights reserved.