The Controller Pak is the Nintendo 64's solution to the memory card seen in the PlayStation and other CD-ROM-based video game consoles. It plugs into the slot in the back of a Nintendo 64 controller. The standard Controller Pak contains 256 KB memory, which is divided into 123 pages. Bigger memory cards usually made by third parties ranged from around 1-4MB in size. The Controller Pak was mostly used by third parties to store player data. First-party games typically used on-cartridge storage (SRAM, EEPROM, or FlashRAM) to store the save data, but would still use the Controller Pak for storing additional data, such as Mario Kart 64, which stored Ghosts from Time Trial mode on the Controller Pak.
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The front and back of a Nintendo 64 Controller Pak