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Since this document is a compilation of several other people's information, one might think it's pretty redundant. The key point here however is how nicely all the knowledge is presented. Instead of staring at the usual ugly txt mess in an text editor this compilation would be worthy of being sold as a printed book.

There are some slight mistakes related to timing information, but unless you want to write an emulator that shouldn't concern you for everyday ROM hacking use.

Documents like this prove to me that presentation does make a difference.