Is there a specification of x86 I/O port assignment?

Question

I found some information on the web as follows, but incomplete.

http://en.wikipedia.org/wiki/Input/output_base_address

http://wiki.osdev.org/I/O_Ports

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Answer 1

For classic (i.e. pre-1995) information on ports, the Bochs project has a very useful list of XT, AT and PS/2 port addresses. The list is fairly comprehensive, although the preamble warns the reader to "not consider this information as complete and accurate".