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(multiboot.info)BIOS device mapping techniques

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BIOS device mapping techniques
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   Both of these techniques should be usable from any PC operating
system, and neither require any special support in the drivers
themselves. This section will be flushed out into detailed
explanations, particularly for the I/O restriction technique.

   The general rule is that the data comparison technique is the quick
and dirty solution. It works most of the time, but doesn't cover all the
bases, and is relatively simple.

   The I/O restriction technique is much more complex, but it has
potential to solve the problem under all conditions, plus allow access
of the remaining BIOS devices when not all of them have operating system
drivers.

Data comparison technique

I/O restriction technique