Click here to download the off-line version of this article. Table of Contents 1. Foreword 2. Prerequisite 2.1. PCI BUS 2.2. ISA BUS 3. Some Hardware Peculiarities 3.1. BIOS Chip Addressing 3.2. Obscure Hardware Port 3.3. "Relocatable" Hardware Port 3.4. Expansion ROM Handling 4. Some Software Peculiarities 4.1. Call Instruction Peculiarity 4.2. Retn Instruction Peculiarity 5. Our Tools of Trade 5