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Re:How SNES emulators got a few pixels from complete perfection by NobodyNada on Thursday April 02, 2020 @01:58PM (#22761705)
http://wiki.nesdev.com/w/index.php/INES#Flags_10:

> Older versions of the iNES emulator ignored bytes 7-15, and several ROM management tools wrote messages in there. Commonly, these will be filled with "DiskDude!", which results in 64 being added to the mapper number.

Re:How SNES emulators got a few pixels from complete perfection by hcs on Thursday April 02, 2020 @04:20PM (#22763268)
That would surely be a giveaway, but I haven't seen any evidence that tagged headers like this were actually used in official Nintendo releases.