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• 18.1 int86--It doesn't always work.
• 18.2 Pointer segment--Some interrupts require it, but how do you get it?
• 18.3 Zero SP--If you don't, your program crashes.
• 18.4 Xfer--Moving data to and from conventional memory.
• 18.5 Move structs--How to move structs from conventional memory.
• 18.6 Fat DS--Fast direct access to memory-mapped devices.
• 18.7 Above 1MB--Interact with memory-mapped devices above 1MB.
• 18.8 RMCB--How to let DOS/BIOS call your code.
• 18.9 Hardware interrupts--How to hook HW interrupts from DJGPP.
• 18.10 _go32 vs __dpmi--Which functions should you use?
• 18.11 HW Int pitfalls--Does your machine wedge? Here are some reasons.
• 18.12 Ports--Reading and writing I/O ports in DJGPP.
• 18.13 Inline Asm--How to write inline assembly with GCC.
• 18.14 DMA--How to use DMA from DJGPP programs.

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