'Developers manual' from Intel(download)...

Forum: The Linux Kernel Hackers' Guide
Re: Protected Mode (ac)
Date: Wed, 15 Oct 1997 21:22:56 GMT
From: Mats Odman <mats-odm@dsv.su.se>

If you have the time, there are "Pentium Processor Family Developers Manual, vol3 Architectur and programming manual" available for download from Intel, only problem is: it's about 1000 pages to print :-)