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A comment on Did Nintendo download a Mario ROM and sell it back to us?. Parent comment

Re:Did Nintendo download a Mario ROM and sell it back to us? by wmil on Saturday January 21, 2017 @05:36AM (#13449602)
No. There's a string to identify the header in the file then a series of bit flags. You wouldn't create an identical header by accident

Nintendo either downloaded the ROM or used pirate tools to make it.

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Re:Did Nintendo download a Mario ROM and sell it back to us? by eridius on Saturday January 21, 2017 @05:54PM (#13452545)
Or they just re-used the format because it already exists and works perfectly well. Don't forget, the "format" in question is just a 16-byte header, it's trivial enough that it would actually be more effort to come up with a brand new format (with absolutely no benefit) than to just re-use the existing 16-byte header definition.
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