Controller Pak
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The Controller Pak was the Nintendo 64's memory card, comparible to those seen in the PlayStation and other CD-ROM-based video game consoles.
Certain games allowed saving of game files to the Controller Pak, which plugged into the back of the Nintendo 64 controller (as did the Rumble and Transfer Paks). The Controller Pak was marketed as a way to exchange data with other Nintendo 64 owners, since information saved on the game cartridge could not be transferred to another cartridge.
However, since the Nintendo 64 used a cartridge game format that can write data on the cartridges themselves, few games used the Controller Pak (most of them were from third-party developers, likely because of cost expenses; including self-contained data on the cartridge would have increased production and retail costs). Some games used it to save optional data that was too large for saving on the cartridge, such as Mario Kart 64, which uses 121 pages for storing "ghost" data (a recording of the player's driving).
While the Nintendo 64 itself does not have a Controller Pak management screen, holding the start button while powering on most Controller Pak-compatible games opens a management screen programmed into the cartridge by the game developer.
The standard Controller Pak contains 256 KB memory, which is divided into 123 "pages." Larger off-brand cards range from around 1-4 MB in size.
