Internal Plexus/SpyBoxOnline's Interpretation

The Internal Plexus is the name given by the community to the system that the Personalization AI is located on in Super Mario 64.

Any code that would locate the Personalization AI has not been found in any of the leaks related to Super Mario 64. This has led to discussion about how the AI can exist within Super Mario 64 without any evidence of it present in the game’s code. However, recent discoveries by Super Mario 64 Conspiracy Rabbit Hole Wiki users has led to the conclusion that the PAI exists on an in-game computer that has been named “the Internal Plexus”.

History
Tests performed by user JellyOnTheInfinite showed that running an original cartridge of Super Mario 64 (which will be referred to as “copy A”) on the Nintendo 64 uses more processing power than running a standard ROM (“copy B”) of Super Mario 64 on the Nintendo 64. This is because of the presence of the Personalization AI in copy A and the AI being absent from copy B.

Because of the long standing idea that Princess Peach’s Castle serves as the “brain” or “center” of the PAI, JellyOnTheInfinite fully removed Princess Peach’s Castle from both copies of the game with ROM hacking tools. This was to prove that the PAI was linked to the castle. When the castle was removed, both copies used the same processing power. It was concluded that the Personalization AI must be connected to Princess Peach’s Castle in such a way that would neutralize it if the castle was removed. Wanting to dig deeper into this connection, JellyOnTheInfinite formed a committee on MIPS Hole dedicated to finding technical proof of the PAI.

The committee had made no major discoveries, with only a few minor complimentary discoveries made until code, rare for a Super Mario 64 leak as most of the information leaked is assets, for starting the game twice when a save file was chosen was found within a Nintendo leak. This led to theorizing from the committee about the relevance of this to the location of the AI. With no concrete evidence, the reason for this code was chalked up to be a leftover from the game’s original multiplayer function. The committee had hit a roadblock, with no further evidence or discoveries related to location of the AI, until a new user posted on the committee’s discussion forums about the lack of any code being present for the AI, while it clearly being active in Super Mario 64. They posited that it might be because of some sort of “in-game computer”, similar to that of computers in Minecraft or Mario Maker, which would be running the AI from within the cartridge instead of the console. With this new perspective, the committee came up with a theory: The reason that the game starts two times is because the “in-game computer” is running from the second game and can interact with the first game. The information that the PAI is based in Princess Peach’s Castle places the location of the “in-game computer” in the castle.

Now, the only missing link is the location of the code related to this “in-game computer”. Even if the PAI is located on an “in-game computer”, that doesn’t make it any less anomalous if there is no code to run it. Analysis of all the assets that make up Princess Peach’s Castle; such as models, textures, sounds, entities, etc. revealed that inside the attributes for the geometry that makes up the castle was code that wasn’t referred to anywhere else other than the leaked code for starting the game up twice. This code was very extensive, and the only reason that it was found is because no one bothered to look there before. In pretty much every single wall, roof, and door of Princess Peach’s Castle was bits and pieces of code; that if put together made up a dynamic artificial intelligence which could change the game in real-time.

The committee published their findings to the public and went down in history with the people who discovered Luigi as great contributors to finding the mysteries of Super Mario 64.

Details
The personalization AI is located on an “in-game computer” nicknamed “The Internal Plexus” which runs off of a parallel instance of Super Mario 64. The reason that the Nintendo 64 can handle two instances of a game running at once is because the instance that the plexus runs on is much more bare-bones than the normal game. The plexus is made up of models in and of Princess Peach’s Castle that contain code to form a system which the PAI can run on.

Theorzing
It is quite interesting that Nintendo went out of their way to design a system to create an “in-game computer” instead of simply normally coding the PAI into the game. Combined with the fact that Nintendo denies and suppresses the existence of the AI and the AI’s technical existence was so well hidden; this might suggest that the reason why the PAI is implemented into Super Mario 64 is because of a third party’s or deviant employee’s tampering with the game. This is the leading theory, as this is one of the only ideas that make sense with the information.