NES reference guide
From Nesdev wiki
The nes reference guide is the section of the wiki were you will find all major hardware reference divided by categories in their simplest form. From this list, you can drill down to a more specific section of the selected category. <br\><br\>
File format reference
- Every major category containing many sub section have a printer friendly link beside their name.
- There is no section for the iNes mapper id yet. Please check this temporary condensed list here.