5 ms·

I can almost guarantee Nintendo did not use a downloaded ROM. I don’t have direct experience with how the ROMs are sourced, so it’s not 100%, but I worked on a

I can almost guarantee Nintendo did not use a downloaded ROM. I don’t have direct experience with how the ROMs are sourced, so it’s not 100%, but I worked on a team handling emulation at Nintendo and can say the processes are incredibly careful and strict. The company is extremely micromanaged and pedantic, and this is not the kind of thing that could possibly be overlooked at Nintendo.

monocasa 7y ago
It's just weird then that they put a header originally defined by pirates, and now otherwise only used by third party emulators. Including matching the even more informal parts of the header byte for byte with the most common dump of the ROM on the high seas.
- derefr 7y ago
  I mean, you'd want to use a file format that would allow you to cross-test your emulator's behavior on the same ROM files against existing emulators' behavior on those ROM files. So you'd format your ROMs (which you dumped yourself) the way that existing emulators would expect them to be formatted.
  - monocasa 7y ago
    Sorry, I was being a bit coy when I said the "more informal parts of the header". It literally still has the dumper's signature in the unused portion of the header. Traceability as to who gets props for the first good dump drives a lot of decisions in that scene.
    - hcs 7y ago
      Could you be more specific? I've heard this mentioned before but not seen an example. Something like one of those Diskdude! strings? What game?
      - NobodyNada 7y ago
        http://wiki.nesdev.com/w/index.php/INES#Flags_10 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.
        hcs 7y ago
        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.
- thristian 7y ago
  > ...a header originally defined by pirates... Specifically, the "iNES header", originally created by Marat Fayzullin for use with his NES emulator, iNES[1]. If you look at the iNES manual[2], way down at the bottom in the changelog for version 0.7, you can see "Sound support completely rewritten, thanks to Kawase Tomohiro". If you search the Internet for Kawase Tomohiro, you'll find[3] somebody by that name seems to work for Nintendo as a programmer, and in particular worked on the NES emulator used in 2001's Animal Crossing. Of course, that's not conclusive evidence, but given the competing claims "Nintendo, a notoriously uptight company, has been downloading pirate ROMs to sell" versus "Nintendo hired a pioneer of NES emulation to work on their emulators, who kept using the tools and formats he was used to", I feel like one is more likely to be true and the other is more likely to get ad impressions. [1]: https://fms.komkon.org/iNES/ https://fms.komkon.org/iNES/ [2]: https://fms.komkon.org/iNES/iNES.html https://fms.komkon.org/iNES/iNES.html [3]: https://nintendo.fandom.com/wiki/Tomohiro_Kawase https://nintendo.fandom.com/wiki/Tomohiro_Kawase
- zzo38computer 7y ago
  It isn't wrong for Nintendo to use the same file format as other emulators, although it is hypocritical. (But including such improper stuff as "DiskDude" (which the emulator doesn't even use, and doesn't properly belong in the header anyways) is a bit wrong, and is even more hypocritical.)
deelowe 7y ago
What other explanation would there be for those headers? They serve no purpose otherwise.
- jcranmer 7y ago
  The other explanation is that they're using an open-source emulator (or some derivative thereof) in their product, so the iNES header would be the expected format to convey the necessary information.

monocasa 7y ago

It's just weird then that they put a header originally defined by pirates, and now otherwise only used by third party emulators. Including matching the even more informal parts of the header byte for byte with the most common dump of the ROM on the high seas.

derefr 7y ago
I mean, you'd want to use a file format that would allow you to cross-test your emulator's behavior on the same ROM files against existing emulators' behavior on those ROM files. So you'd format your ROMs (which you dumped yourself) the way that existing emulators would expect them to be formatted.
- monocasa 7y ago
  Sorry, I was being a bit coy when I said the "more informal parts of the header". It literally still has the dumper's signature in the unused portion of the header. Traceability as to who gets props for the first good dump drives a lot of decisions in that scene.
  - hcs 7y ago
    Could you be more specific? I've heard this mentioned before but not seen an example. Something like one of those Diskdude! strings? What game?
    - NobodyNada 7y ago
      http://wiki.nesdev.com/w/index.php/INES#Flags_10 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.
      - hcs 7y ago
        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.
thristian 7y ago
> ...a header originally defined by pirates... Specifically, the "iNES header", originally created by Marat Fayzullin for use with his NES emulator, iNES[1]. If you look at the iNES manual[2], way down at the bottom in the changelog for version 0.7, you can see "Sound support completely rewritten, thanks to Kawase Tomohiro". If you search the Internet for Kawase Tomohiro, you'll find[3] somebody by that name seems to work for Nintendo as a programmer, and in particular worked on the NES emulator used in 2001's Animal Crossing. Of course, that's not conclusive evidence, but given the competing claims "Nintendo, a notoriously uptight company, has been downloading pirate ROMs to sell" versus "Nintendo hired a pioneer of NES emulation to work on their emulators, who kept using the tools and formats he was used to", I feel like one is more likely to be true and the other is more likely to get ad impressions. [1]: https://fms.komkon.org/iNES/ https://fms.komkon.org/iNES/ [2]: https://fms.komkon.org/iNES/iNES.html https://fms.komkon.org/iNES/iNES.html [3]: https://nintendo.fandom.com/wiki/Tomohiro_Kawase https://nintendo.fandom.com/wiki/Tomohiro_Kawase
zzo38computer 7y ago
It isn't wrong for Nintendo to use the same file format as other emulators, although it is hypocritical. (But including such improper stuff as "DiskDude" (which the emulator doesn't even use, and doesn't properly belong in the header anyways) is a bit wrong, and is even more hypocritical.)

deelowe 7y ago

What other explanation would there be for those headers? They serve no purpose otherwise.

jcranmer 7y ago
The other explanation is that they're using an open-source emulator (or some derivative thereof) in their product, so the iNES header would be the expected format to convey the necessary information.